Walker, E., Elsworth, S., & Lê Ngọc Phương Anh. (2004). New Edition grammar practice for intermediate students. Tp. Hồ Chí Minh: Nxb. Trẻ ; Công ty Văn hoá Sáng tạo Trí Việt.
শিকাগো স্টাইলে সাইটেশনWalker, Elaine, Steven Elsworth, এবং Lê Ngọc Phương Anh. New Edition Grammar Practice for Intermediate Students. Tp. Hồ Chí Minh: Nxb. Trẻ ; Công ty Văn hoá Sáng tạo Trí Việt, 2004.
এমএলএ সাইটেশনWalker, Elaine, Steven Elsworth, এবং Lê Ngọc Phương Anh. New Edition Grammar Practice for Intermediate Students. Tp. Hồ Chí Minh: Nxb. Trẻ ; Công ty Văn hoá Sáng tạo Trí Việt, 2004.
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