↑ Schassburger, R.M. (1987). "Wolf vocalization: An integrated model of structure, motivation, and ontogeny". dalam H. Frank. Man and Wolf. Dordrecht, Belanda: Dr. W. Junk.
↑ Coscia, E.M. "Ontogeny of timber wolf vocalizations: Acoustic properties and behavioral contexts". Ph.D. Dissertation. Halifax, Nova Scotia, Kanada: Universiti Dalhousie.
↑ Fedderson-Peterson, D.U. (2000). "Vocalization of European wolves (Canus lupus lupus L.) and various dog breeds (Canus lupus f., fam.)". Arch. Tierz. Kiel, Jerman: Institut für Haustierkunde, Christian-Albrechts-University. 4: 387–397.
1 2 Coppinger, R. (1991). "'Hark! Hark! The dogs do bark...' and bark and hark". Smithsonian. 21: 119–128. Parameter |coauthors= tidak diketahui diabaikan (guna |author=) (bantuan)
↑ Belyaev, D.K. (1984). "Domestication in the silver fox (Vulpus fulvus desm.) - changes in physiological boundaries of the sensitive period of primary socialization". Applied Animal Behaviour Science. 13 (4): 359–370. Parameter |coauthors= tidak diketahui diabaikan (guna |author=) (bantuan)
↑ Fox, M.W. (1986). Saunders, W.B., penyunting. "The influence of domestication upon behavior of animals". Abnormal Behaviour in Animals. Philadelphia: 179–187.
↑ Dechambre, E. (1949). "La theorie de la foetalisation et la formation des races de chiens et de porcs". Mammalia (dalam bahasa Perancis). 13: 129–137.
↑ Fox, M.W. (1971). "Behavior of wolves and related canids". Malabar, Florida.
