Birkett, P. J., Vanak, A. T., Muggeo, V. M. R., Ferreira, S. M., & Slotow, R. (2012). Animal Perception of Seasonal Thresholds: Changes in Elephant Movement in Relation to Rainfall Patterns. Public Library of Science.

Birkett, Patricia J., Abi T. Vanak, Vito M. R. Muggeo, Salamon M. Ferreira, och Rob Slotow. Animal Perception of Seasonal Thresholds: Changes in Elephant Movement in Relation to Rainfall Patterns. Public Library of Science, 2012.

Birkett, Patricia J., et al. Animal Perception of Seasonal Thresholds: Changes in Elephant Movement in Relation to Rainfall Patterns. Public Library of Science, 2012.