APA (7th ed.) Citation

Helbing, L., & Derleth, L. (1958). Ludwig-Derleth-Gedenkbuch: [Mitarbeit: Lothar Helbing]. Castrum Peregrini.

Chicago Style (17th ed.) Citation

Helbing, Lothar, and Ludwig Derleth. Ludwig-Derleth-Gedenkbuch: [Mitarbeit: Lothar Helbing]. Amsterdam: Castrum Peregrini, 1958.

MLA (8th ed.) Citation

Helbing, Lothar, and Ludwig Derleth. Ludwig-Derleth-Gedenkbuch: [Mitarbeit: Lothar Helbing]. Castrum Peregrini, 1958.

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