Donald Lay J R, Ebehard Von Borell, & Solon A Ewing. (1999). Farm Animal Well-Being Stress Physiology, animal behavior, and environmental design (1.). New Jersey.
Dyfyniad Arddull ChicagoDonald Lay J R, Ebehard Von Borell, and Solon A Ewing. Farm Animal Well-Being Stress Physiology, Animal Behavior, and Environmental Design. 1. New Jersey, 1999.
Dyfyniad MLADonald Lay J R, et al. Farm Animal Well-Being Stress Physiology, Animal Behavior, and Environmental Design. 1. New Jersey, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.