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IRVING E. SIGEL, . (1968). LOGIICAL THINKINGIN CHILDREN. NEW YORK: INC.
IRVING E. SIGEL, . 1968. LOGIICAL THINKINGIN CHILDREN. NEW YORK: INC.
IRVING E. SIGEL, . LOGIICAL THINKINGIN CHILDREN. NEW YORK: INC. 1968.