Collins. (2014). Cambridge English flyers: Three practice tests for Cambridge English : Flyers (YLE Flyers). T.P. Hồ Chí Minh: Tổng hợp T.P. Hồ Chí Minh; Công ty TNHH Nhân Trí Việt.
শিকাগো স্টাইলে সাইটেশনCollins. Cambridge English Flyers: Three Practice Tests for Cambridge English : Flyers (YLE Flyers). T.P. Hồ Chí Minh: Tổng hợp T.P. Hồ Chí Minh; Công ty TNHH Nhân Trí Việt, 2014.
এমএলএ সাইটেশনCollins. Cambridge English Flyers: Three Practice Tests for Cambridge English : Flyers (YLE Flyers). T.P. Hồ Chí Minh: Tổng hợp T.P. Hồ Chí Minh; Công ty TNHH Nhân Trí Việt, 2014.
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