PUBLISHED BY: B. F. Skinner Foundation ISBN: Hardcover: Library of Congress Card Number 68-12340 E 81290 Published originally in 1968. Reprinted by the Foundation in 2003.
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PUBLISHED BY: B. F. Skinner Foundation ISBN: Hardcover: 1-58390-007-1, Paperback: 0-87411-487-X Published originally in 1938. Reprinted by the B. F. Skinner Foundation, 1991 and 1999.
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