APA (7th ed.) Citation

Spengler, O. (1921). Pessimismus? Stilke.

Chicago Style (17th ed.) Citation

Spengler, Oswald. Pessimismus? Berlin: Stilke, 1921.

MLA (8th ed.) Citation

Spengler, Oswald. Pessimismus? Stilke, 1921.

Warning: These citations may not always be 100% accurate.