• Andersen AC, Wooten E, 1959: The estrous cycle of the dog. In Cole HH, Cupps PT: Reproduction in Domestic Animals. Ed. Academic Press, pp:359-97.
  • Baba E, Hata H, Fukata T, Arakawa A, 1983: Vaginal and uterine microflora of adult dogs. Am J Vet Res 44, 606-9.
  • Bell ET, Christie DW, 1971: Duration of proestrus, oestrus and vulval bleeding in the beagle bitch. Br Vet J 27, 25-27.
  • Concannon PW, 1983: Reproductive physiology and endocrine patterns of the bitch. Curr Vet Ther Small Anim Pract 8, 886-90.
  • Concannon PW, DiGregorio GB, 1986: Canine vaginal cytology. In Burke TJ (ed): Small Animal Reproduction and Infertility, A clinical Approach to Diagnosis and Treatment. Philadelphia, Lea and Febiger, pp: 96-111.
  • Concannon PW, Hansel W, Visek WJ, 1975: The ovarian cycle of the bitch: plasma estrogen, LH and progesterone. Biol Reprod 13, 112-21.
  • Concannon P, Hansel W, McEntee K, 1977a: Changes in LH, progesterone and sexual behaviour associated with preovulatory luteinization in the bitch. Biol Reprod 17, 604-13.
  • Concannon PW, McCann JP, Temple M, 1989: Biology and endocrinology of ovulation. In Kirk RW (Ed.): Current Veterinary Therapy X. Philadelphia, WB Saunders, pp:1247-59.
  • England G, Concannon PW: Determination of the optimal breeding time in the bitch: basic considerations. In Recent Advances in Small Animal Reproduction. PW Concannon, G England, J Verstegen, C Linde-Forsberg (ed). International veterinary Information Service (www.ivis.org), Ithaca. New York. Usa.
  • Feldman EC, Nelson RW, 2004: Endocrinology and Reproduction Canine and Feline. 3rd edition. Ed. Saunders.
  • Goodman M, 2001: Ovulation timing concepts and controversies. In Veterinary Clinics of North America; Small Animal Practice, Clinical theriogenology 31, 2, March.
  • Goodwin M, Gooding KM, Regnier F, 1979: Sex pheromone in the dog. Science 203, 559-61.
  • Handley JC, 1975: Total unconjugated oestrogen and progesterone concentrations in peripheral blood during the oestrous cycle of the dog. J Rep Fert 44: 445-51.
  • Holst PA, Phemister RD, 1974: Onset of diestrus in the beagle bitch: Definition and significance. Am J VET Res 35, 401-6.
  • Jeffcoate, 1992a: Concentrations of luteinizing hormona and oestradiol in plasma and response to injection of gonadotrophin-relasing hormone analogue at selected stages of anoestrus in domestic bitches. J Reprod Fertil 94, 423-29.