Cita APA (7a ed.)

Perske, R., & Perske, M. (1988). Circles of friends: People with disabilities and their friends enrich the lives of one another. Abingdon.

Cita Chicago Style (17a ed.)

Perske, Robert, y Martha Perske. Circles of Friends: People with Disabilities and Their Friends Enrich the Lives of One Another. Nashville: Abingdon, 1988.

Cita MLA (9a ed.)

Perske, Robert, y Martha Perske. Circles of Friends: People with Disabilities and Their Friends Enrich the Lives of One Another. Abingdon, 1988.