Cresci, M. W. (1992). Complete book of model business letters. HCM.: ĐHTH.
Trích dẫn kiểu ChicagoCresci, Martha W. Complete Book of Model Business Letters. HCM.: ĐHTH, 1992.
ציטוט MLACresci, Martha W. Complete Book of Model Business Letters. HCM.: ĐHTH, 1992.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.