Cita APA (7th ed.)

Spengler, O. (1918). The decline of the west. AUWSF.

Cita Chicago (17th ed.)

Spengler, Oswald. The Decline of the West. London: AUWSF, 1918.

Cita MLA (9th ed.)

Spengler, Oswald. The Decline of the West. AUWSF, 1918.