Cita APA (7a ed.)

King, F., O'Gorman, D., & Cree, D. A. (1981). English business letters: Commercial correspondence for foreign students (New ed., [3rd. imp.].). Longman.

Cita Chicago Style (17a ed.)

King, F.W, David O'Gorman, y D. Ann Cree. English Business Letters: Commercial Correspondence for Foreign Students. New ed., [3rd. imp.]. London: Longman, 1981.

Cita MLA (9a ed.)

King, F.W, et al. English Business Letters: Commercial Correspondence for Foreign Students. New ed., [3rd. imp.]. Longman, 1981.