Ryan, M. P., Hastorf, A. H., & Cofer, C. N. (1975). Programmed learning aid for person perception. Learning Systems Company.
Chicago Style (17. basım) AtıfRyan, Michael P., Albert H. Hastorf, ve Charles N. Cofer. Programmed Learning Aid for Person Perception. Homewod, Illinois: Learning Systems Company, 1975.
MLA (9th ed.) AtıfRyan, Michael P., et al. Programmed Learning Aid for Person Perception. Learning Systems Company, 1975.
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