Cita APA (7a ed.)

Polunin, O., & Everard, B. (1969). Flowers of Europe: A field guide. Oxford University Press.

Cita Chicago Style (17a ed.)

Polunin, Oleg, y Barbara Everard. Flowers of Europe: A Field Guide. London [et al.]: Oxford University Press, 1969.

Cita MLA (9a ed.)

Polunin, Oleg, y Barbara Everard. Flowers of Europe: A Field Guide. Oxford University Press, 1969.