APA (7th ed.) Citation

Kassner, R., Burckhardt, C. J., & Pfeiffer-Belli, E. (1958). Geistige Welten. Ullstein Bücher.

Chicago Style (17th ed.) Citation

Kassner, Rudolf, Carl Jacob Burckhardt, and Erich Pfeiffer-Belli. Geistige Welten. West-Berlin: Ullstein Bücher, 1958.

MLA (8th ed.) Citation

Kassner, Rudolf, et al. Geistige Welten. Ullstein Bücher, 1958.

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