Dyfyniad APA
Hickman, c. P., Hickman, F., & Roberts, L. S. (1989). Biology of animals (4th ed.). Mosby college.
Dyfyniad Arddull Chicago
Hickman, cleveland P., Frances Hickman, and Larry S. Roberts. Biology of Animals. 4th ed. St. Louis: Mosby college, 1989.
Dyfyniad MLA
Hickman, cleveland P., et al. Biology of Animals. 4th ed. Mosby college, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.