Não informado. (1956). Educational Screen and Audio-visual Guide. Educational Screen.
Style de citation Chicago (17e éd.)Não informado. Educational Screen and Audio-visual Guide. Chicago, Ill: Educational Screen, 1956.
Style de citation MLA (8e éd.)Não informado. Educational Screen and Audio-visual Guide. Educational Screen, 1956.
Attention : ces citations peuvent ne pas être correctes à 100%.