APA (7th ed.) Citation
Duff, C., & Stamford, P. (1960). German for beginners: By Charles Duff and Paul Stamford. Barnes and Noble.
Chicago Style (17th ed.) Citation
Duff, Charles, and Paul Stamford. German for Beginners: By Charles Duff and Paul Stamford. New York: Barnes and Noble, 1960.
MLA (9th ed.) Citation
Duff, Charles, and Paul Stamford. German for Beginners: By Charles Duff and Paul Stamford. Barnes and Noble, 1960.
Warning: These citations may not always be 100% accurate.