APA (7th ed.) Citation

Cree, D. A., & O'Gorman, D. (1979). English business letters: Commercial correspondence for foreign students (New ed.). Longman.

Chicago Style (17th ed.) Citation

Cree, D. Ann, and David O'Gorman. English Business Letters: Commercial Correspondence for Foreign Students. New ed. Essex, England: Longman, 1979.

MLA (9th ed.) Citation

Cree, D. Ann, and David O'Gorman. English Business Letters: Commercial Correspondence for Foreign Students. New ed. Longman, 1979.