APA (7th ed.) Citation
Rubin, Z., & Höpfner, T. M. (1981). Kinderfreundschaften: (Children's Friendship [Deutsch]). Klett-Cotta.
Chicago Style (17th ed.) Citation
Rubin, Zick, and Thomas M. Höpfner. Kinderfreundschaften: (Children's Friendship [Deutsch]). Stuttgart: Klett-Cotta, 1981.
MLA (9th ed.) Citation
Rubin, Zick, and Thomas M. Höpfner. Kinderfreundschaften: (Children's Friendship [Deutsch]). Klett-Cotta, 1981.
Warning: These citations may not always be 100% accurate.