Clark, Ronald.Einstein, the life and time. New York: World , 1971.
2.
Bagley, Danial S.Structured fantasy as a stimulus for enhancing short range creative problem-solving performance in adults. Unpublished dissertation. The University of Tennessee , 1977.
3.
Gordon, W.J.J.Some source material in discovery-by-analogy . Journal of Creative Behavior, 1974, 8 (4), 239-257 .
4.
Gowan, J.C.The Development of the Creative Individual, San Diego: R. Knapp , 1972.
5.
Gowan, J.C.the Development of the Psychedelic Individual, Buffalo : The Creative Education Foundation , 1974.
6.
Khatena, J. , Imagination and production of original verbal images . Art Psychotherapy, 1973, 1, 113-120 .
7.
Torrance, E.P.Tendency to produce unusual visual perspective as a predictor of creative achievement . Perceptual and Motor Skills, 1973, 34, 911-915 .
8.
Leonard, G. & Lindauer, M.S. , Aesthetic participation and imagery arousal . Perceptual and Motor Skills, 1973, 38, 977-978 .