| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Agricultural and Food Policy | 978-0-13-171873-9 (0-13-171873-8) | 2006 | Ronald D. Knutson · J.B. L. Penn |
| Agricultural and Food Policy, Fifth Edition | 978-0-13-064845-7 (0-13-064845-0) | 2003 | Ronald D. Knutson · J. B. Penn |