توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Howell, M. C. (1989). Serving the underserved: Caring for people who are both old and mentally retarded : a handbook for caregivers. Exceptional Parent Press.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Howell, Mary C. Serving the Underserved: Caring for People Who Are Both Old and Mentally Retarded : A Handbook for Caregivers. Boston: Exceptional Parent Press, 1989.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Howell, Mary C. Serving the Underserved: Caring for People Who Are Both Old and Mentally Retarded : A Handbook for Caregivers. Exceptional Parent Press, 1989.