APA (7th ed.) Zitazioa
Duff, C., & Stamford, P. (1960). German for beginners: By Charles Duff and Paul Stamford. Barnes and Noble.
Chicago Style (17th ed.) Zitazioa
Duff, Charles, eta Paul Stamford. German for Beginners: By Charles Duff and Paul Stamford. New York: Barnes and Noble, 1960.
MLA (9th ed.) Zitazioa
Duff, Charles, eta Paul Stamford. German for Beginners: By Charles Duff and Paul Stamford. Barnes and Noble, 1960.
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