APA (7th ed.) Citation

Burkhardt, D., Altner, H., & Schleidt, W. (1967). Signals in the animal world. George Ahhen & Unwin.

Chicago Style (17th ed.) Citation

Burkhardt, Dietrich, Helmut Altner, and Wolfgang Schleidt. Signals in the Animal World. London: George Ahhen & Unwin, 1967.

MLA (9th ed.) Citation

Burkhardt, Dietrich, et al. Signals in the Animal World. George Ahhen & Unwin, 1967.