Đặng Thị Phương Trang. (2012). A Study on Ways Expressing Politeness in Bad news Business Letters in English. Khoa Anh CN.
Chicago Style aipamenaĐặng Thị Phương Trang. A Study On Ways Expressing Politeness in Bad News Business Letters in English. Khoa Anh CN, 2012.
MLA aipamenaĐặng Thị Phương Trang. A Study On Ways Expressing Politeness in Bad News Business Letters in English. Khoa Anh CN, 2012.
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