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Nevin, J. A., & Shettleworth, S. J. (1966). An analysis of contrast effects in multiple schedules. J Exp Anal Behav, 9(4), 305–315.
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Alexander, F. (1966). A study of parotid salivation in the horse. J Physiol, 184(3), 646–656.
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Heptner Vg,. (1966). 2. Wildpferd, Tarpan Equus (Equus przewalski Poljakov 1881) In: Die Säugetiere der Sowjetunion. In In: Heptner V G & Naumov N P (ed.) Jena (pp. 858–874).
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