Gaya APA

Snell, M, E. (1983). Systematic Instruction of the Moderately and Severely Handicapped (Ed. 2). Columbus: Charles E. Merrill Publishing Co..

Gaya MLA

Snell, Martha, E.. "Systematic Instruction of the Moderately and Severely Handicapped". Ed. 2 Columbus: Charles E. Merrill Publishing Co., 1983. Text.