APA (7th ed.) Citation

Duff, C. (1947). How to learn a language. Basil Blackwell.

Chicago Style (17th ed.) Citation

Duff, Charles. How to Learn a Language. Oxford: Basil Blackwell, 1947.

MLA (9th ed.) Citation

Duff, Charles. How to Learn a Language. Basil Blackwell, 1947.

Warning: These citations may not always be 100% accurate.