[et.all.], M., E.(1983).SYSTEMATIC INSTRUCTION OF THE MODERATELY AND SEVERELY HANDICAPPED (Second Edition).Jakarta:Bell & Howell Company.
Gaya MLA
[et.all.], Martha, E.Snell."SYSTEMATIC INSTRUCTION OF THE MODERATELY AND SEVERELY HANDICAPPED".Second EditionJakarta:Bell & Howell Company,1983.Buku Inti.