1. Almeida, M. de, O. S. Garcia, and J. Biondini: Anatomical study of the terminal parts of the excretory ducts of the vesicula seminalis in Sus domesticus. Arq. Esc. Vet. 17, 1965.
2. Ammann, R. P., L. Johnson and B. W. Pickett: Connection between the seminiferous tubules and the efferent ducts in the stallion. Am. J. Vet. Res. 38 (1977).
3. Archibald, J., and E. J. Bishop: Radiographic visualization of the canine prostate gland. J. A. V. M. A. 128, 1956.
4. Armingaud, A.: L’ os pénien des carnivores domestiques. Rev. Méd. Vét. 84, 1932.
5. Aronson, L. R., and M. L. Cooper: Penile spines of the domestic cat: Their endocrine-behavior relations. Anat. Rec. 157, 1967.