Z39.19 Guidelines for the Construction, Format, and Management of Monolingual Thesauri, NISO Press, 1993. Available from http://www.techstreet.com/nisogate.html

Introduction to Vocabularies (Getty Institute Tutuorial)
http://www.getty.edu/research/institute/vocabulary/introvocabs/

AACR2, a.k.a. Anglo American Cataloging Rules, 2nd Edition, ISBN: 0838934854
Also available as The Concise AACR2, ISBN: 0838934943 www.library.cornell.edu/tsmanual/CIRM/AACR2.html