Ashton, H., & Shepherd, S. (2013). Work on your accent. T.P. Hồ Chí Minh: Tổng hợp T.P. Hồ Chí Minh; Công ty TNHH Nhân Trí Việt.
শিকাগো স্টাইলে সাইটেশনAshton, Helen, এবং Sarah Shepherd. Work On Your Accent. T.P. Hồ Chí Minh: Tổng hợp T.P. Hồ Chí Minh; Công ty TNHH Nhân Trí Việt, 2013.
এমএলএ সাইটেশনAshton, Helen, এবং Sarah Shepherd. Work On Your Accent. T.P. Hồ Chí Minh: Tổng hợp T.P. Hồ Chí Minh; Công ty TNHH Nhân Trí Việt, 2013.
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