Cita APA (7a ed.)

Spengler, O. (1934). The hour of decision (1a.ed.). Alfred A. Knopf.

Cita Chicago Style (17a ed.)

Spengler, Oswald.. The Hour of Decision. 1a.ed. New York: Alfred A. Knopf, 1934.

Cita MLA (8a ed.)

Spengler, Oswald.. The Hour of Decision. 1a.ed. Alfred A. Knopf, 1934.