APA (7th ed.) Citation

Silverberg, R. (1981). Öffnet den Himmel. Moewig.

Chicago Style (17th ed.) Citation

Silverberg, Robert. Öffnet Den Himmel. München: Moewig, 1981.

MLA (9th ed.) Citation

Silverberg, Robert. Öffnet Den Himmel. Moewig, 1981.

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