D.H. · D Harper · Don Harper PhD.
Barron's Educational Series · HarperCollins · Interpet Publishing · Krone · Parragon Plus · Salamander Books
| title | ISBN-13 | year of publica- tion | |
|---|---|---|---|
| Caring for Your Pet Budgies | 978-1-902389-80-6 | 1999 | |
| Caring for Your Pet Budgies | 978-1-85600-059-8 | 1996 | |
| Collins Discover Nature 12c Mxd Prepack | 978-0-06-136403-7 | 2007 | |
| Collins Need to Know? - Aquarium Fish | 978-0-00-720578-3 | 2006 | |
| Das Pferd. Verhalten - Erziehung - Pflege | 978-3-937485-34-8 | 2005 | |
| Dogs | 978-1-85813-866-4 | 1994 | |
| My Big Box of Horses and Ponies | 978-0-7641-9548-8 | 2008 | |
| The Dog Owner's Question & Answer Book | 978-0-7641-0647-7 | 1998 |