O'Neill, R., & Robert O'Neill; Trầm Thanh Sơn; Trầm Thị Xuân Hương. (1999). Business news: For reading & speaking components in Bec2&Bec3 =. Đồng Nai: Nxb. Đồng Nai.
Chicago-tyylinen lähdeviittausO'Neill, Robert, ja Robert O'Neill; Trầm Thanh Sơn; Trầm Thị Xuân Hương. Business News: For Reading & Speaking Components in Bec2&Bec3 =. Đồng Nai: Nxb. Đồng Nai, 1999.
MLA-viiteO'Neill, Robert, ja Robert O'Neill; Trầm Thanh Sơn; Trầm Thị Xuân Hương. Business News: For Reading & Speaking Components in Bec2&Bec3 =. Đồng Nai: Nxb. Đồng Nai, 1999.
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