APA (7th ed.) Citation

Brumfit, C. (1980). Problems and principles in English teaching. Pergamon Press.

Chicago Style (17th ed.) Citation

Brumfit, Christopher. Problems and Principles in English Teaching. Oxford: Pergamon Press, 1980.

MLA (9th ed.) Citation

Brumfit, Christopher. Problems and Principles in English Teaching. Pergamon Press, 1980.

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