APA
Wells J. C. &. C. G., . (1971). Practical phonetics. Pitman publishing, London: .
Chicago
Wells J C & Colson Greta, . 1971. Practical phonetics. Pitman publishing, London: .
Harvard
Wells J. C. &. C. G., . (1971). Practical phonetics. Pitman publishing, London: .
MLA
Wells J C & Colson Greta, . Practical phonetics. Pitman publishing, London: . 1971.