* Spengler, Oswald ♦ The Decline of the West, v. 1: Form and Actuality Authorized translation, 1926 ♦ George Allen & Unwin, London
* Spengler, Oswald ♦ The Decline of the West, v. 2: Perspectives of World-history Authorized translation, 1928 ♦ George Allen & Unwin, London
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