APA (7th ed.) Citation

Ludz, P. C., Lübbe, H., & Spengler, O. (1980). Spengler heute: Sechs Essays. Beck.

Chicago Style (17th ed.) Citation

Ludz, Peter Christian, Hermann Lübbe, and Oswald Spengler. Spengler Heute: Sechs Essays. München: Beck, 1980.

MLA (8th ed.) Citation

Ludz, Peter Christian, et al. Spengler Heute: Sechs Essays. Beck, 1980.

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