APA Citation

Ahlheim, K., Winnenburg, W., & Grill, G. M. (1989). Schülerduden "Die Astronomie". Dudenverlag.

MLA Citation

Ahlheim, Karl-Heinz, Wolfram Winnenburg, and Gerd M.A Grill. Schülerduden "Die Astronomie". Dudenverlag, 1989.

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