Cita APA (7a ed.)

Educators' guide to free filmstrips. 1st- ed. 1949-. Educators Progress Service.

Cita Chicago Style (17a ed.)

Educators' Guide to Free Filmstrips. 1st- Ed. 1949-. Randolph, Wis: Educators Progress Service.

Cita MLA (9a ed.)

Educators' Guide to Free Filmstrips. 1st- Ed. 1949-. Educators Progress Service.