cross-reference(n = noun.communication) cross-index - a reference at one place in a work to information at another place in the same work;
is a kind of acknowledgment, citation, cite, credit, mention, quotation, reference

   a reference at one place in a work to information at another place in the same work. [WordNet 1.5]

cross-reference, n. & v.
--n. a reference from one part of a book, article, etc., to another.
--v.tr. provide with cross-references.