Complex cross reference:

Cross reference displays generated from the reference note fields are complex cross references. They are carried directly in records as reference note fields. In a complex cross reference display, the content of the 1XX field of a record is the heading referred from, and, following a reference instruction phrase, the reference note field contains the heading(s) referred to. In fields 260 and 360 , the complete reference instruction may be a combination of a phrase implicitly associated with the field tag and explicit text in subfield $i (Explanatory text). In fields 663 , 664 , 665 , and 666 , the reference instruction text is contained in subfield $a (Explanatory text).

The definition of Tag Related Reference Instruction Phrase with subfield $i and guidelines for applying subfields $a in 4XX and 5XX fields, as well as examples of complex cross reference displays, are in Reference Note Fields: Complex Cross References .