1. The perineum of the mare;Habel;Cornell Vet,1953
2. Equine urogenital system—female genitalia;Sisson,1975
3. Observations on the length and angle of declination of the vulva and its relation to fertility in the mare;Pascoe;J Reprod Fertil Suppl,1979
4. Reproductive organs of the mare;Kainer,1993
5. Examination of the vulva, vestibule, vagina, and cervix;Ley,1999