APA (7th ed.) Citation

Osborn, F. (1940). Preface to eugenics. Harper.

Chicago Style (17th ed.) Citation

Osborn, Frederick. Preface to Eugenics. New York [u.a.]: Harper, 1940.

MLA (9th ed.) Citation

Osborn, Frederick. Preface to Eugenics. Harper, 1940.

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