1. American Veterinary Medical Association Council on Veterinary Service, 1980. Protocol for the tattoo identification of dogs and cats that have been spayed or neutered. American Veterinary Medical Association House of Delegates, Schaumburg, Illinois.
2. Orchiectomy and ovariohysterectomy;Biernrier,2018
3. “State of the mewnion”: Practices of feral cat care and advocacy organizations in the United States;Aeluro;Front. Vet. Sci.,2021
4. Ear tips to ear tags: Marking and identifying cats treated with non-surgical fertility control;Benka;J. Feline Med. Surg.,2015
5. Berkeley, E., Perry, 2004. TNR past, present, and future: A history of the trap-neuter-return movement. Alley Cat Allies, Washington, DC.