APA (7th ed.) Citation

Piers, F. (1968). Orchids of East Africa (2., fully revised and enlarged edition.). Cramer.

Chicago Style (17th ed.) Citation

Piers, Frank. Orchids of East Africa. 2., fully revised and enlarged edition. Lehre: Cramer, 1968.

MLA (9th ed.) Citation

Piers, Frank. Orchids of East Africa. 2., fully revised and enlarged edition. Cramer, 1968.