NACO: Additional 670 Fields
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Princeton University Cataloging Documentation

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Additional 670 fields

Sources other than the item cataloged, if consulted, may be cited in any order. The same principles of selectivity and conciseness apply. Each source is recorded in a separate 670 field, with the exception that different issues of the same serial run are cited in the same 670 field. Note that each 670 field must always contain the name being established, exactly as found in the source, even if it repeats information already in the record. Cite birth and death dates, as well as other identifying information.

For more details and examples, see: Reference Sources