توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Westermann, D., & Ward, I. C. (1933). Practical phonetics for students of African languages. Published for the International Institute of African Languages & Cultures by Oxford University Press, H. Milford.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Westermann, Diedrich, و Ida C. Ward. Practical Phonetics for Students of African Languages. London: Published for the International Institute of African Languages & Cultures by Oxford University Press, H. Milford, 1933.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Westermann, Diedrich, و Ida C. Ward. Practical Phonetics for Students of African Languages. Published for the International Institute of African Languages & Cultures by Oxford University Press, H. Milford, 1933.