Ninth International African Seminar University College, Dar es Salaam, & Whiteley, W. H. e. (1971). Language use and social change: Problems of multilingualism with special reference to Eastern Africa : studies presented and discussed at the ninth International African Seminar at University College, Dar es Salaam, December 1968, ed. with an introd. by W.H. Whiteley, foreword by Daryll Forde. International African Institute by Oxford University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ninth International African Seminar University College, Dar es Salaam, و Wilfred Howell editor Whiteley. Language Use and Social Change: Problems of Multilingualism with Special Reference to Eastern Africa : Studies Presented and Discussed at the Ninth International African Seminar at University College, Dar Es Salaam, December 1968, Ed. with an Introd. by W.H. Whiteley, Foreword by Daryll Forde. [London]: International African Institute by Oxford University Press, 1971.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ninth International African Seminar University College, Dar es Salaam, و Wilfred Howell editor Whiteley. Language Use and Social Change: Problems of Multilingualism with Special Reference to Eastern Africa : Studies Presented and Discussed at the Ninth International African Seminar at University College, Dar Es Salaam, December 1968, Ed. with an Introd. by W.H. Whiteley, Foreword by Daryll Forde. International African Institute by Oxford University Press, 1971.