Bowden, Edwin T.
James Thurber: a bibliography
Ohio State University Press, 1968
Buku Teks SO
Harris, James C.
Intellectual disability : understanding its development, causes, classification, evaluation, and treatment
Oxford University Press, 2006
Buku Teks SO
Digital media law / Ashley Packard
Blackwell , 2010
eBooks
Guidelines for project evaluation Industrial development Organization
United Nations
United Nations, 1972
Buku Teks
Education and disability
edited by Susan J. Peters
Garland, 1993
Buku Referensi