| title | media type | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|---|
| Alle lieben Knut | Gebunden | 978-3-89782-321-1 | 2008 | Isabella Hatkoff · Craig Hatkoff | |
| Good-Bye Tonsils! | Paperback | 978-0-14-240133-0 | 2004 | Craig Hatkoff | |
| Good-Bye Tonsils! | Hardcover | 978-0-670-89775-9 | 2001 | " | |
| Knut, der kleine Eisbärenjunge | Gebunden | 978-3-473-55216-0 | 2007 | Isabella Hatkoff · Craig Hatkoff · Gerald R. Uhlich | |
| Knut: How One Little Polar Bear Captivated the World | Hardcover | 978-0-545-04716-6 | 2007 | Craig Hatkoff · Isabella Hatkoff · Dr. Gerald R. Uhlich | |
| Knut: La historia del osito polar que cautivó al mundo entero: | Paperback | 978-0-545-05658-8 | 2007 | Isabella Hatkoff · Craig Hatkoff | |
| Knut: L'Ourson Polaire Qui Captiva Le Monde | " | 978-0-545-99216-9 | 2008 | Dr Gerald R Uhlich · Craig Hatkoff · Isabella Hatkoff | |
| Knut The Baby Polar Bear | Board book | 978-0-545-06157-5 | 2008 | Isabella Hatkoff | |
| Leo the Snow Leopard | Hardcover | 978-0-545-22927-2 | 2010 | Craig Hatkoff · Isabella Hatkoff | |
| Looking For Miza: The True Story of the Mountain Gorilla Family Who Rescued on of Their Own | " | 978-0-545-08540-3 | 2008 | Isabella Hatkoff · Craig Hatkoff · Dr. Paula Kahumbu | |
| Winter's Tail: How One Little Dolphin Learned to Swim Again | Paperback | 978-0-545-34830-0 | 2011 | Craig Hatkoff · Isabella Hatkoff · David Yates | |
| Winter's Tail: How One Little Dolphin Learned To Swim Again | Hardcover | 978-0-545-12335-8 | 2009 | Isabella Hatkoff · Craig Hatkoff |
F.X. Schmid · Penguin · Ravensburger Buchverlag · Scholastic · Viking