Department of phonetics and spoken english central institute of english and foreign language. (2014). Excercises in spoken english: Part 2 consonants (24th Ed.). Oxford University Press.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Department of phonetics and spoken english central institute of english and foreign language. Excercises in Spoken English: Part 2 Consonants. 24th Ed. NEW DELHI: Oxford University Press, 2014.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Department of phonetics and spoken english central institute of english and foreign language. Excercises in Spoken English: Part 2 Consonants. 24th Ed. Oxford University Press, 2014.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.