Business objectives. (1997). Business objectives: Student's book and work book with answer key. Đồng Nai: Nxb. Đồng Nai.
Chicago-stil citatBusiness objectives. Business Objectives: Student's Book and Work Book With Answer Key. Đồng Nai: Nxb. Đồng Nai, 1997.
MLA-referensBusiness objectives. Business Objectives: Student's Book and Work Book With Answer Key. Đồng Nai: Nxb. Đồng Nai, 1997.
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