APA (7th ed.) Citation

Greenberg, A., Herzog, W., & Achternbusch, H. (1976). Heart of glass. Skellig.

Chicago Style (17th ed.) Citation

Greenberg, Alan, Werner Herzog, and Herbert Achternbusch. Heart of Glass. München: Skellig, 1976.

MLA (8th ed.) Citation

Greenberg, Alan, et al. Heart of Glass. Skellig, 1976.