Payne, James S.
Mental retardation
Charles Merrill Publishing, 1981
 Buku Teks
Problematika yang dihadapi keluarga dari anak dengan intellectual disability (studi etnografi)
 Artikel Jurnal
Cynthia Rusdian
Hubungan antara psychological well-being dan keterlibatan orang tua dalam pendidikan anak disabilitas intelektual usia kanak-kanak (4-11 tahun) =The Relationship between Psychological Well-Being and Parent Involvement in Education of Intellectual Disability Children in Childhood (4-11 years old)
Fakultas Psikologi Universitas Indonesia, 2012
 UI - Skripsi Open
Cynthia Rusdian
Hubungan antara psychological well-being dan keterlibatan orang tua dalam pendidikan anak disabilitas intelektual usia kanak-kanak (4-11 tahun) = The relationship between psychological well-being and parent involvement in education of intellectual disability children in childhood (4-11 years old)
Fakultas Psikologi Universitas Indonesia, 2012
 UI - Skripsi Open
Drew, Clifford J.
Mental retardation : a life cycle approach
A Bell & Howell Company, 1986
 Buku Teks SO