1. Ball, S. Bogatz, G.,The first year of Sesame Street: An evaluation. Princeton: Educational Testing Service, PR 70-15, 1970.
2. Berlyne, D.,Structure and direction in thinking. New York: Wiley, 1961.
3. Birdwhistell, R., “Movement with speech,” inKinesics and Context. Philadelphia: University of Pennsylvania Press, 1970. Pp. 110–127.
4. Charlesworth, W., “The role of surprise in cognitive development. in Elkind, D. and Flavell, J. (eds.),Studies in Cognitive Development. New York: Oxford University Press, 1969. Pp. 257–314.
5. Fowles, B., “A pilot study of verbal report in formative research in television.” Unpublished doctoral dissertation, 1973.