APA (7th ed.) Citation

Fitter, R., & Fitter, M. (1967). The Penguin dictionary of British natural history / by R. Fitter and M. Fitter. Penguin.

Chicago Style (17th ed.) Citation

Fitter, Richard, and M. Fitter. The Penguin Dictionary of British Natural History / by R. Fitter and M. Fitter. Penguin, 1967.

MLA (9th ed.) Citation

Fitter, Richard, and M. Fitter. The Penguin Dictionary of British Natural History / by R. Fitter and M. Fitter. Penguin, 1967.

Warning: These citations may not always be 100% accurate.