Diana L Fried-Booth. (1993). Tài liệu luyện thi chứng chỉ Cambridge Pet: Preliminary English Test. Tp. HCM: Trẻ.
শিকাগো স্টাইলে সাইটেশনDiana L Fried-Booth. Tài Liệu Luyện Thi Chứng Chỉ Cambridge Pet: Preliminary English Test. Tp. HCM: Trẻ, 1993.
এমএলএ সাইটেশনDiana L Fried-Booth. Tài Liệu Luyện Thi Chứng Chỉ Cambridge Pet: Preliminary English Test. Tp. HCM: Trẻ, 1993.
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