Here is a great list of books with Champ mentions from NewAnimal.com. Great site about all sorts of … new animals. Here is the lake/sea monster page.

Benjamin, R.W. Champ – Lake Champlain Monster

Blackman, W. Haden. The Field Guide to North American Monsters. New York: Three Rivers Press, 1998. Pages 54-56

Champ

Clark, Jerome and Coleman, Loren. Cryptozoology A-Z. New York: Simon & Schuster, 1999. Pages 56-60, 103.

Clark, Jerome. Unexplained!. Detroit: Visible Ink Press, 1999. Pages 235-244

Clogston, Sean & Lloyd, Nancy. The Legendary Champ of Lake Champlain

Coleman, Loren. Mysterious America: The Revised Edition. New York: Paraview Press, 2001. Pages 16, 85-86, 90, 97-104

Hall, Dennis Jay. Champ Quest 2000 : The Ultimate Search Field Guide & Almanac for Lake Champlain

Krystek, Lee. Champ of Lake Champlain

Newton, Michael. Encyclopedia of Cryptozoology: A Global Guide to Hidden Animals and Their Pursuers. Jefferson, North Carolina: McFarland & Company, 2005. Pages 94-96, 123, 251, 376, 418, 435, 507

Rose, Carol. Giants, Monsters and Dragons: An Encyclopedia of Folklore, Legend and Myth. Santa Barbara, California: ABC-CLIO, 2000. Pages 74-75

Steiger, Brad. Out of the Dark: The Complete Guide to Beings from Beyond. New York: Kensington Books, 2001. Pages 85-86

Weidensaul, Scott. The Ghost with Trembling Wings: Science, Wishful Thinking and the Search for Lost Species. New York: North Point Press, 2002. Pages 156-157, 165

Wikipedia, The. Champ

Zarzynski, Joseph. Champ: Beyond the Legend. Montpelier, Vermont: Capitol City Press, 1988.