Westermann, D., & Ward, I. C. (1964). Practical phonetics for students of African languages. Publication for the International African Institute by the Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWestermann, Diedrich, और Ida Caroline Ward. Practical Phonetics for Students of African Languages. London: Publication for the International African Institute by the Oxford University Press, 1964.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWestermann, Diedrich, और Ida Caroline Ward. Practical Phonetics for Students of African Languages. Publication for the International African Institute by the Oxford University Press, 1964.
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