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2.
Jaspen, N. (1950b). Technical Report SDC 269-7-11, The Instructional Film Research Program, ThePennsylvania State College.
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Kishler, J.P. (1950). Technical Report SDC 269-7-10, The Instructional Film Research Program, ThePennsylvania State College.
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8.
Vander Mcer, A.W. (1950). Technical Report SDC 269-7-13, The Instructional Film Research Program, ThePennsylvania State College.
9.
Vincent, W.S., Ash, P., and Greenhill, L.P. (1949). Technical Report SDC 269-7-7, The Instructional Film Research Program, The Pennsylvania State Gollege.
10.
Zuckerman, J.V. (1949). Technical Report SDC 269-7-14, The Instructional Film Research Program, ThePennsylvania State College.