Indexação de livros:

American society of Indexers http://www.asindexing.org/site/index.html

The Indexing and Abstracting Society of Canada
Société canadienne pour l'analyse de documents http://www.indexingsociety.ca/

Vários Thesaurus Online: http://www.asindexing.org/site/thesonet.shtml

Indexers Unlimited:
http://www.indexersunlimited.org/

Word for Word Book Services:
http://www.wfwbooks.com/

Index Students:
http://www.indexstudents.com/