APA (7th ed.) Citation

Müller, A., & Müller, S. (1997). The complete idiot's guide to learning German on your own. Alpha Books.

Chicago Style (17th ed.) Citation

Müller, Alice, and Stephan Müller. The Complete Idiot's Guide to Learning German on Your Own. New York, NY: Alpha Books, 1997.

MLA (9th ed.) Citation

Müller, Alice, and Stephan Müller. The Complete Idiot's Guide to Learning German on Your Own. Alpha Books, 1997.