Παραπομπή APA
(1954). Commercial correspondence for students of english as a second language: Educational services. New York: McGraw-Hill Book Company.
Παραπομπή Chicago StyleCommercial Correspondence for Students of English As a Second Language: Educational Services. New York: McGraw-Hill Book Company, 1954.
Παραπομπή MLACommercial Correspondence for Students of English As a Second Language: Educational Services. New York: McGraw-Hill Book Company, 1954.
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