APA (7th ed.) Citation

Layer, H., & Schreiber, W. K. Probleme lösen. Quelle & Meyer.

Chicago Style (17th ed.) Citation

Layer, Hans, and Wilfried K. Schreiber. Probleme Lösen. Heidelberg: Quelle & Meyer.

MLA (9th ed.) Citation

Layer, Hans, and Wilfried K. Schreiber. Probleme Lösen. Quelle & Meyer.

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