APA (7th ed.) Citation

Knop, W. G. J. (1949). Prowling Russia's forbidden zone: A secret journey into Soviet Germany ([1st ed.].). A.A. Knopf.

Chicago Style (17th ed.) Citation

Knop, Werner Gustav John. Prowling Russia's Forbidden Zone: A Secret Journey into Soviet Germany. [1st ed.]. New York: A.A. Knopf, 1949.

MLA (9th ed.) Citation

Knop, Werner Gustav John. Prowling Russia's Forbidden Zone: A Secret Journey into Soviet Germany. [1st ed.]. A.A. Knopf, 1949.