1. MA. Ngo Dinh Dung (2001). Gathering information about the client. Youth Publishing House
2. Ths. Nguyen Van Hung (2013). Syllabus Basic Marketing. Economic Publishing House
3. The synthesis report of the Company Ltd. is a member of Hong Hoang Bao trade
4. The text of the internal circulation member limited liability company trading Hong Hoang Bao
5. Other documents
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