APA (7th ed.) Citation

Bierens de Haan, J. A. (1949). Animal psychology: Its nature and its problems. Hutchinson's University Library.

Chicago Style (17th ed.) Citation

Bierens de Haan, J. A. Animal Psychology: Its Nature and Its Problems. London ; New York: Hutchinson's University Library, 1949.

MLA (9th ed.) Citation

Bierens de Haan, J. A. Animal Psychology: Its Nature and Its Problems. Hutchinson's University Library, 1949.