Não informado. (1956). Educational Screen and Audio-visual Guide. Educational Screen.
Chicago-Zitierstil (17. Ausg.)Não informado. Educational Screen and Audio-visual Guide. Chicago, Ill: Educational Screen, 1956.
MLA-Zitierstil (8. Ausg.)Não informado. Educational Screen and Audio-visual Guide. Educational Screen, 1956.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.