APA (7th ed.) Citation

Polunin, O. (1997). The flowers of Europe: A field guide. Oxford University Press.

Chicago Style (17th ed.) Citation

Polunin, Oleg. The Flowers of Europe: A Field Guide. Oxford: Oxford University Press, 1997.

MLA (9th ed.) Citation

Polunin, Oleg. The Flowers of Europe: A Field Guide. Oxford University Press, 1997.