Birdlife international
Varanoid lizards of the world is a comprehensive account of virtually everything important that is known about monitor lizards and their allies.
Beginning with detailed species accounts and proceediing to various modern comparative analyses. Where possible, people who have had detailed field experience with a particulair species have assembled the species accounts. In the process of reporting what is known, the book also identifies what remains to be learned about these lizards.

E. Pianka and D. King, 2004 pages: 640 ISBN: 0-253-34366-6