- Modoc: The True Story of the Greatest Elephant That Ever LivedRalph D. Helfer · New York, NY: HarperCollins, 1998 · ISBN: 0060929510
- Mosey: The Remarkable Friendship of a Boy and His ElephantRalph D. Helfer · London, United Kingdom: Orchard Books, 2002 · ISBN: 0439293138
- Zamba: The True Story of the Greatest Lion That Ever LivedRalph D. Helfer · New York, NY: HarperCollins, 2005 · ISBN: 0060761326
- The Beauty of the Beasts: Tales of Hollywood's Wild Animal StarsRalph D. Helfer · New York, NY: HarperCollins, 2007 · ISBN: 0874775167
- Los Angeles Times (US)"Taming of the School : Ralph Helfer Brings His 40 Years of Exotic-Animal Training for Films and TV to the Classroom"November 29, 1991 · pg. 1 · by: Steve Appleford
- LOS ANGELES TIMES (US)"Taming of the School : Ralph Helfer Brings His 40 Years of Exotic-Animal Training for Films and TV to the Classroom"November 29, 1991 · by: Steve Appleford
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