↑ Papini, M.R. (2003). Comparative Psychology. In Handbook of Research Methods in Experimental Psychology. Ed. Stephen F. Davis. Blackwell. Malden, MA.
↑ Dewsbury, D. (1984). Comparative Psychology in the Twentieth Century. Hutchinson Ross Publishing Company. Stroudsburg, PA.
↑ Tinbergen, N. (1963). "On aims and methods of ethology". Zeitschrift fur Tierpsychologie. 20: 410–33.
