1. Fehrman, P. G., & Hagel, F. The effect of suggestion on horizontal movement in the autokinetic illusion. Unpublished manuscript, Judson College, 1969.
2. Beets, A., & Whiting, M. The effect of the experimenter’s sex on perception of suggested movement in the autokinetic illusion. Unpublished manuscript, Spring Arbor College, 1972