Hellmann, E. (1940). Problems of urban Bantu youth: Report of an enquiry into the causes of early school-leaving and occupational opportunities amongst Bantu youth in Johannesburg. South African Institute of Race Relations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hellmann, Ellen. Problems of Urban Bantu Youth: Report of an Enquiry into the Causes of Early School-leaving and Occupational Opportunities Amongst Bantu Youth in Johannesburg. Johannesburg: South African Institute of Race Relations, 1940.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hellmann, Ellen. Problems of Urban Bantu Youth: Report of an Enquiry into the Causes of Early School-leaving and Occupational Opportunities Amongst Bantu Youth in Johannesburg. South African Institute of Race Relations, 1940.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.