APA استشهاد

Knutson, R. D., Penn, J. B., & Boehm, W. T. (1990). Agricultural and Food Policy (2nd ed.). Prentice Hall.

استشهاد بنمط شيكاغو

Knutson, Ronald D., J. B. Penn, و William T. Boehm. Agricultural and Food Policy. 2nd ed. Englewood Cliffs, N.J.: Prentice Hall, 1990.

MLA استشهاد

Knutson, Ronald D., et al. Agricultural and Food Policy. 2nd ed. Prentice Hall, 1990.