APA (7th ed.) Citation

(1957). Geography in the twentieth century: A study of growth, fields, techniques, aims and trends (3. ed., enlarged.). Philosophical Library [u.a.].

Chicago Style (17th ed.) Citation

Geography in the Twentieth Century: A Study of Growth, Fields, Techniques, Aims and Trends. 3. ed., enlarged. New York: Philosophical Library [u.a.], 1957.

MLA (9th ed.) Citation

Geography in the Twentieth Century: A Study of Growth, Fields, Techniques, Aims and Trends. 3. ed., enlarged. Philosophical Library [u.a.], 1957.