APA (7th ed.) Citation

Duttweiler, C., & Duttweiler, C. (1990). The 20000 sentences and expressions of business and personal correspondence: Based on key words in alphabetical order with cross-references to "Les 20000 phrases" and "Die 20000 Sätze" (1. Aufl.). Rentrop.

Chicago Style (17th ed.) Citation

Duttweiler, Claude, and Claude Duttweiler. The 20000 Sentences and Expressions of Business and Personal Correspondence: Based on Key Words in Alphabetical Order with Cross-references to "Les 20000 Phrases" and "Die 20000 Sätze". 1. Aufl. Bonn: Rentrop, 1990.

MLA (9th ed.) Citation

Duttweiler, Claude, and Claude Duttweiler. The 20000 Sentences and Expressions of Business and Personal Correspondence: Based on Key Words in Alphabetical Order with Cross-references to "Les 20000 Phrases" and "Die 20000 Sätze". 1. Aufl. Rentrop, 1990.