APA (7th ed.) Citation

Berg, L. S. (1950). Natural regions of the U.S.S.R. Macmillan.

Chicago Style (17th ed.) Citation

Berg, L. S. Natural Regions of the U.S.S.R. New York: Macmillan, 1950.

MLA (9th ed.) Citation

Berg, L. S. Natural Regions of the U.S.S.R. Macmillan, 1950.