APA (7th ed.) Citation

Posthumus, O. (1938). Malayan fern studies.

Chicago Style (17th ed.) Citation

Posthumus, Oene. Malayan Fern Studies. Amsterdam, 1938.

MLA (9th ed.) Citation

Posthumus, Oene. Malayan Fern Studies. 1938.

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