MLA

Schellenberg, Walter. The Labyrinth : Memoirs of Walter Schellenberg. New York: Harper, 1956.

APA

Schellenberg, W. (1956). The labyrinth : memoirs of Walter Schellenberg. New York: Harper.

Chicago

Schellenberg, Walter, The Labyrinth: Memoirs of Walter Schellenberg. New York: Harper, 1956.