Journal of Experimental Psychology, 1942. Paperback. Thin octavo. Staple-bound. On offprint reprinted from the Journal of Experimental Psychology, Vol. 30, No. 6, June, 1942. An early work by Skinner preceeding his famous Walden Two by six years. Signed: "With the compliments of B.F. Skinner" on the outer wrapper. Rare. More