T. M. Hazzard,
“Abnormal Estrus”, in
Clinical Veterinary Advisor: Dogs and Cats , St. Louis, MO: Mosby Inc., 2009.
T. M. Hazzard,
“Prolonged Anestrus.”, in
Clinical Veterinary Advisor: Dogs and Cats , St. Louis, MO: Mosby Inc., 2017.
T. M. Hazzard,
“Prolonged Estrus”, in
Clinical Veterinary Advisor: Dogs and Cats , St. Louis, MO: Mosby Inc., 2009.