Cita APA (7th ed.)

McCarty, H. R., & Hartsell, H. C. (1959). The cooperative approach to audio-visual programs. s.n.

Cita Chicago (17th ed.)

McCarty, Henry R., i Horace C. Hartsell. The Cooperative Approach to Audio-visual Programs. [Washington: s.n, 1959.

Cita MLA (9th ed.)

McCarty, Henry R., i Horace C. Hartsell. The Cooperative Approach to Audio-visual Programs. s.n, 1959.