| First Indicator | Second Indicator |
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| Undefined # - Undefined |
Undefined # - Undefined |
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Citation for a consulted source in which information is found related in some manner to the entity represented by the authority record or related entities. May also include the information found in the source.
Each source citation is contained in a separate 670 field.
Citation for a consulted source that yielded no information is contained in field 675 (Source Data Not Found).
Citations and information in this field are often not written in a form adequate for public user display.
$a - Source citation
Citation for a published work or a description of any source or action that provided information about the heading (e.g., a telephone call to a publisher). The citation includes enough information to identify the work, such as the title and imprint date. When a work has a non-distinctive title (e.g., a generic term), the citation may begin with the name of the author. When the author is the same as the 1XX heading, one of the following may be used in the citation: His, Her, Author's (gender unknown), or Its (not a personal name). When a 100 heading is used for more than one person (008/32, Undifferentiated personal name, code b), subfield $a may contain a descriptive term for an author enclosed within brackets (e.g., [Author of Ireland]).
| 110 | 2#$aOxon Hill Manor (Md.) | ||||||||
| 670 | ##$aPhone call to National Register of Historic Places | ||||||||
| 110 | 2#$aWorld Bank | ||||||||
| 670 | ##$aIts Annual report, 1981:$bp.3 (The World Bank is a group of three institutions, the International Bank for Reconstruction and Development (IBRD), the International Development Association (IDA), and the International Finance Corporation (IFC)) | ||||||||
| 100 | 1#$aSmith, Howard | ||||||||
| 670 | ##$a[Added entry of Inside Japan] | ||||||||
| 670 | ##$aInside Japan, 1981 (a.e.)$bverso t.p. (Howard Smith) | ||||||||
| 670 | ##$a[Author of Ireland] | ||||||||
| 670 | ##$aHis Ireland, 1974:$bt.p. (Howard Smith) | ||||||||
| 130 | #0$aHeadline series | ||||||||
| 670 | ##$aHarsch, Joseph C. Germany at war, 1942: ser. t.p.
(Headline books) [The source cited contains information only concerning a series related to the series being established.] |
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| 100 | 1#$aBreay, Phillis | ||||||||
| 670 | ##$aOCLC, Mar. 1, 2012$b(hdg.: Breay, Phillis) | ||||||||
| 675 | ##$aThe mine explored, 1850 [Name being established was not given in the work cataloged; information found in OCLC WorldCat for the same and/or similar works attributed to Phillis Breay.] |
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$b - Information found
Parenthetical statement of the information found in the source. A statement of the location of the information within the source, such as cover, t.p., foreword, may also be contained in subfield $b. Multiple occurrences of location/information found within the same source are contained in a single subfield $b.
| 100 | 1#$aDefoe, Daniel,$d1661?-1731 | ||||||||
| 670 | ##$aInU/Wing STC files$b(usage: a lay-hand in the country) | ||||||||
| 110 | 2#$aTwin City Federal | ||||||||
| 670 | ##$aLund, D. A. Billions for homes, c1980 (subj.)$bt.p. (TCF) verso t.p. (Twin City Federal) p. 11 (founded 4-2-23) | ||||||||
| 110 | 2#$aBentley Historical Library | ||||||||
| 670 | ##$aBillington, R. A.$bLocal history is ... 1974. | ||||||||
| 670 | ##$aIts Guide to manuscripts in the Bentley Historical Library, 1976:$bt.p. (Bentley Historical Library, Michigan Historical Collections, Univ. of Mich.) | ||||||||
| 130 | #0$aAstronomy library | ||||||||
| 670 | ##$aEicher, D.J. Beyond the solar system, c1992:$bt.p. (Astronomy library) | ||||||||
$u - Uniform Resource Identifier
Uniform Resource Identifier (URI), for example a URL or URN, which provides electronic access data in a standard syntax. This data can be used for automated access to an electronic item using one of the Internet protocols.
| 100 | 1#$aKing, Stephen,$d1947- | ||||||||
| 670 | ##$aThe official Stephen King web presence, viewed Oct. 26, 2001:$bThe man (Stephen Edwin King; b. Portland, Maine, 1947)$uhttp://www.stephenking.com | ||||||||
$w - Bibliographic record control number
System control number of the related record preceded by the MARC code, enclosed in parentheses, for the agency to which the control number applies.
| 150 | ##$aDunking (Basketball) | ||||||||
| 670 | ##$aWork cat: Year of the dunk, 2015$w(DLC)2014041716 | ||||||||
| 150 | ##$aCabala | ||||||||
| 670 | ##$aBloom, H. Kabbalah and criticism, c1975$w(DLC)75012820$w(OCoLC)1339798 | ||||||||
| 100 | 1#$aSnyder, G. Irvin | ||||||||
| 670 | ##$aOur soldier boys in khaki o'er in France, ©1918:$bt.p. (G. Irvin Snyder)$w(DLC)2014561136$w(OCoLC)899258216 | ||||||||
$6 - Linkage
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See description of this subfield in Appendix A: Control Subfields.
Punctuation and Spacing - Punctuation and spacing is a matter of judgment. The examples used in the Guidelines area reflect current Library of Congress practice.
Order - First 670 field in a record should contain the citation for the work for which the 1XX heading is being established whenever there is one. Other sources may be listed in any order.