Cita APA (7th ed.)

Westermann, D., & Ward, I. C. (1933). Practical phonetics for students of African languages. Pub. for the International institute of African languages & cultures by Oxford University press.

Cita Chicago (17th ed.)

Westermann, Diedrich, i Ida Caroline Ward. Practical Phonetics for Students of African Languages. London: Pub. for the International institute of African languages & cultures by Oxford University press, 1933.

Cita MLA (9th ed.)

Westermann, Diedrich, i Ida Caroline Ward. Practical Phonetics for Students of African Languages. Pub. for the International institute of African languages & cultures by Oxford University press, 1933.