Παραπομπή APA

Knutson,Ronald D, & Penn,J B. (1995). Agricultural and food policy (3.). Prentice Hall Education Career and technology.

Παραπομπή Chicago Style

Knutson,Ronald D, και Penn,J B. Agricultural and Food Policy. 3. New Jersey: Prentice Hall Education Career and technology, 1995.

Παραπομπή MLA

Knutson,Ronald D, και Penn,J B. Agricultural and Food Policy. 3. Prentice Hall Education Career and technology, 1995.