Hintikka, Jaakko, 1929- What if-- ? : toward excellence in reasoning / Jaakko Hintikka, James Bachman. - Mountain View, Ca. : Mayfield Pub., c1991. - xiv, 465 p. : ill. ; 24 cm. Includes index. ISBN: 0874849640 LCCN: 90044120 Subjects--Topical Terms: Reasoning.Critical thinking. LC Class. No.: BC177 / .H59 1991 Dewey Class. No.: 160