Cita APA (7th ed.)

the Elder, P., & Healy, J. F. (1991). Natural history: Selection. Penguin Books.

Cita Chicago (17th ed.)

the Elder, Pliny, i John F. Healy. Natural History: Selection. London: Penguin Books, 1991.

Cita MLA (9th ed.)

the Elder, Pliny, i John F. Healy. Natural History: Selection. Penguin Books, 1991.