| Geist, V., 1974. On the relationship of ecology and behaviour in the evolution of ungulates: theoretical considerations: vol. 1, pp. 235-246
| In: Geist, V. et al. The behaviour of ungulates and its relation to management. Morges, IUCN (Publications New series no. 24): vol. 1, pp. 1-511; vol. 2, pp. 512-941 |
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| Geist, V.; Walther, F., 1971. The behaviour of ungulates and its relation to management. Morges, IUCN (Publications New series no. 24), vol. 1, pp. 1-511; vol. 2, pp. 512-941
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