Não informado. Annual Proceedings. American Association of Zoo Veterinarians.
Chicago-viite (17. p.)Não informado. Annual Proceedings. Seattle, Wash: American Association of Zoo Veterinarians.
MLA-viite (8. p.)Não informado. Annual Proceedings. American Association of Zoo Veterinarians.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.