Harvey, J. M. (1978). Statistics Africa: Sources for social, economic, and market research (Second edition Revised and enlarged.). CBD Research ; distributed by Gale Research Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Harvey, Joan M. Statistics Africa: Sources for Social, Economic, and Market Research. Second edition Revised and enlarged. Kent, England. : Detroit: CBD Research ; distributed by Gale Research Co., 1978.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Harvey, Joan M. Statistics Africa: Sources for Social, Economic, and Market Research. Second edition Revised and enlarged. CBD Research ; distributed by Gale Research Co., 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.