Afonja, S. A. (1971). Differential rates of industrial accidents between colured and white workers in Great Britain. University of Birminghaml.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Afonja, Simi A. Differential Rates of Industrial Accidents Between Colured and White Workers in Great Britain. England: University of Birminghaml, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Afonja, Simi A. Differential Rates of Industrial Accidents Between Colured and White Workers in Great Britain. University of Birminghaml, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.