APA (7th ed.) Citation

Phillips, H. (1990). Mathematische Puzzles. Hugendubel.

Chicago Style (17th ed.) Citation

Phillips, Hubert. Mathematische Puzzles. München: Hugendubel, 1990.

MLA (9th ed.) Citation

Phillips, Hubert. Mathematische Puzzles. Hugendubel, 1990.

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