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web.archive.org
Larsen J. "Canine pseudopregnancy"(PDF). UC Davis School of Veterinary Medicine. Archived from the original(PDF) on 5 June 2015. Retrieved 2017-10-13.
Gobello C, Concannon PW, Verstegen J (August 2001). "Canine pseudopregnancy: a review."(PDF). In Concannon PW, England G, Verstegen J (eds.). Recent advances in Small animal reproduction. Ithaca, New York: International Veterinary Information Service. Archived from the original(PDF) on April 19, 2011.