APA (7th ed.) Citation

Kowalczyk, W., & Ottich, K. (2002). Besser lernen. WEKA-Media.

Chicago Style (17th ed.) Citation

Kowalczyk, Walter, and Klaus Ottich. Besser Lernen. Kissing: WEKA-Media, 2002.

MLA (9th ed.) Citation

Kowalczyk, Walter, and Klaus Ottich. Besser Lernen. WEKA-Media, 2002.

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