Trut, Lyudmila N. (1999). "Early Canid Domestication: The Farm-Fox Experiment: Foxes bred for tamability in a 40-year experiment exhibit remarkable transformations that suggest an interplay between behavioral genetics and development". American Scientist. 87 (2): 160-169. doi:10.1511/1999.2.160. ProQuest215262475.
Trut, Lyudmila N. (1999). "Early Canid Domestication: The Farm-Fox Experiment: Foxes bred for tamability in a 40-year experiment exhibit remarkable transformations that suggest an interplay between behavioral genetics and development". American Scientist. 87 (2): 160-169. doi:10.1511/1999.2.160. ProQuest215262475.