Não informado. (1941). Educators guide to free films. Educators Progress League.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educators Guide to Free Films. Randolph, Wis: Educators Progress League, 1941.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educators Guide to Free Films. Educators Progress League, 1941.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.