Cita APA (7a ed.)

Baumgart, D., Johnson, J., & Helmstetter, E. (1990). Augmentative and alternative communication systems for persons with moderate and severe disabilities. Paul H. Brookes.

Cita Chicago Style (17a ed.)

Baumgart, Diane, Jeanne Johnson, y Edwin Helmstetter. Augmentative and Alternative Communication Systems for Persons with Moderate and Severe Disabilities. Baltimore [etc.]: Paul H. Brookes, 1990.

Cita MLA (9a ed.)

Baumgart, Diane, et al. Augmentative and Alternative Communication Systems for Persons with Moderate and Severe Disabilities. Paul H. Brookes, 1990.