Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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