Cita APA (7a ed.)

Hartsell, H. C., & McCarty, H. R. (1962). The cooperative approach to audio-visual programs (2nd print.). National Education Association of the United States. Committe on County Cooperative Programs.

Cita Chicago Style (17a ed.)

Hartsell, Horace C., y Henry R. McCarty. The Cooperative Approach to Audio-visual Programs. 2nd print. Washington: National Education Association of the United States. Committe on County Cooperative Programs, 1962.

Cita MLA (9a ed.)

Hartsell, Horace C., y Henry R. McCarty. The Cooperative Approach to Audio-visual Programs. 2nd print. National Education Association of the United States. Committe on County Cooperative Programs, 1962.