APA (7th ed.) Citation

Blume, H., Hingst, K., Lauer, W., Fischer, G., & Sticker, E. (1968). Amerika. Westermann.

Chicago Style (17th ed.) Citation

Blume, Helmut, Klaus Hingst, Wilhelm Lauer, Gerhard Fischer, and Elisabeth Sticker. Amerika. Braunschweig: Westermann, 1968.

MLA (9th ed.) Citation

Blume, Helmut, et al. Amerika. Westermann, 1968.