Tohutoro APA (7th ed.)

CHRISTOPHERSEN, P. (1956). An english phonetics. Longmans; London, Longmans.

Tohutoru Kātū Chicago (17th ed.)

CHRISTOPHERSEN, Paul. An English Phonetics. Ikeja, Acera: Longmans; London, Longmans, 1956.

Tohutoro MLA (9th ed.)

CHRISTOPHERSEN, Paul. An English Phonetics. Longmans; London, Longmans, 1956.