SOLLEY, C M Problem solving difficulty as function of deviation of meaning of physical cues from expected meaning. [electronic resource] - The Journal of general psychology Jul 1957 - 165-71 p. digital Publication Type: Journal Article ISSN: 0022-1309 Standard No.: 10.1080/00221309.1957.9920357 doi Subjects--Topical Terms: CuesHumansLearningProblem Solving