Jones, L. (1999). Tài liệu luyện thi bằng Proficiency: New progress to proficiency : with full key answers for every excrise and further footnotes for evry unit. Tp. HCM: Trẻ.
Style de citation ChicagoJones, Leo. Tài Liệu Luyện Thi Bằng Proficiency: New Progress to Proficiency : With Full Key Answers for Every Excrise and Further Footnotes for Evry Unit. Tp. HCM: Trẻ, 1999.
Style de citation MLAJones, Leo. Tài Liệu Luyện Thi Bằng Proficiency: New Progress to Proficiency : With Full Key Answers for Every Excrise and Further Footnotes for Evry Unit. Tp. HCM: Trẻ, 1999.
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