APA

Ergang R. R., . (1941). The Potsdam führer: Frederick William I, father of Prussian militarism. New York: Columbia University Press.

Chicago

Ergang Robert Reinhold, . 1941. The Potsdam führer: Frederick William I, father of Prussian militarism. New York: Columbia University Press.

Harvard

Ergang R. R., . (1941). The Potsdam führer: Frederick William I, father of Prussian militarism. New York: Columbia University Press.

MLA

Ergang Robert Reinhold, . The Potsdam führer: Frederick William I, father of Prussian militarism. New York: Columbia University Press. 1941.