APA (7th ed.) Citation

Duncan, F. M. (1943). British shells. Penguin.

Chicago Style (17th ed.) Citation

Duncan, F. Martin. British Shells. London ; New York: Penguin, 1943.

MLA (9th ed.) Citation

Duncan, F. Martin. British Shells. Penguin, 1943.

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