Timberg, E. E., & Gorham, K. A. (1967). Selected reading suggestions for parents of mentally retarded children. U.S.Department of Health, Education, and Welfare, Social and Rehabilitation Service, Children's Bureau.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Timberg, Eleanor Ernst, و Kathryn Aring Gorham. Selected Reading Suggestions for Parents of Mentally Retarded Children. Wash.: U.S.Department of Health, Education, and Welfare, Social and Rehabilitation Service, Children's Bureau, 1967.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Timberg, Eleanor Ernst, و Kathryn Aring Gorham. Selected Reading Suggestions for Parents of Mentally Retarded Children. U.S.Department of Health, Education, and Welfare, Social and Rehabilitation Service, Children's Bureau, 1967.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.