APA-Zitierstil (7. Ausg.)

Duff, C. (1948). How to learn a language: A Book for Beginners and all others who may be interested. Charles Duff (Reprinted.). Basil Blackwell.

Chicago-Zitierstil (17. Ausg.)

Duff, Charles. How to Learn a Language: A Book for Beginners and All Others Who May Be Interested. Charles Duff. Reprinted. Oxford: Basil Blackwell, 1948.

MLA-Zitierstil (9. Ausg.)

Duff, Charles. How to Learn a Language: A Book for Beginners and All Others Who May Be Interested. Charles Duff. Reprinted. Basil Blackwell, 1948.