APA (7th ed.) Citation

Fitter, R. (1967). The Penguin dictionary of british natural history. Penguin Books.

Chicago Style (17th ed.) Citation

Fitter, Richard. The Penguin Dictionary of British Natural History. Londres: Penguin Books, 1967.

MLA (9th ed.) Citation

Fitter, Richard. The Penguin Dictionary of British Natural History. Penguin Books, 1967.