1. Able, K.P. (1981) Mechanisms of orientation, navigation and homing, in Animal Migration, Orientation and Navigation (ed. S.A. Gauthreaux), Academic Press, New York, pp. 283–373.
2. Adler, K. (1976) Extraocular photoreception in amphibians. Photochem. Photobiol., 23, 275–98.
3. Arak, A. (1983) Sexual selection by male-male competition in natterjack toad choruses. Nature, 306, 261–2.
4. Breckenridge, W.J. and Tester, J.R. (1961) Growth, local movements and hibernation of the Manitoba toad, Bufo hemiophrys. Ecology., 42, 637–46.
5. Breden, F. (1987) The effect of post-metamorphic dispersal on the population genetic structure of Fowler’s toad, Bufo woodhousei fowleri. Copeia, 1987, 386–94.