Não informado. (1956). Educational Screen and Audio-visual Guide. Educational Screen.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educational Screen and Audio-visual Guide. Chicago, Ill: Educational Screen, 1956.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educational Screen and Audio-visual Guide. Educational Screen, 1956.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.