Dyfyniad APA

Knutson, R. D., Penn, J. B., & Flinchbaugh, B. L. (1998). Agricultural and food policy (4th ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Knutson, Ronald D., J. B. Penn, and Barry L. Flinchbaugh. Agricultural and Food Policy. 4th ed. Upper Saddle River, N.J: Prentice Hall, 1998.

Dyfyniad MLA

Knutson, Ronald D., et al. Agricultural and Food Policy. 4th ed. Prentice Hall, 1998.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.