Acker, D., & Cunningham, M. (1991). Animal science and industry (4th ed.). Prentice Hall.
Dyfyniad Arddull ChicagoAcker, Duane, and Merle Cunningham. Animal Science and Industry. 4th ed. Englewood Cliffs, N.J: Prentice Hall, 1991.
Dyfyniad MLAAcker, Duane, and Merle Cunningham. Animal Science and Industry. 4th ed. Prentice Hall, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.