Cita APA (7a ed.)

Snell, M. E. (1993). Instruction of students with severe disabilities (4th ed.). Merrill [etc.].

Cita Chicago Style (17a ed.)

Snell, Martha E. Instruction of Students with Severe Disabilities. 4th ed. New York [etc.]: Merrill [etc.], 1993.

Cita MLA (9a ed.)

Snell, Martha E. Instruction of Students with Severe Disabilities. 4th ed. Merrill [etc.], 1993.