Fogelin, Robert J. Understanding arguments : an introduction to informal logic / Robert J. Fogelin, Walter Sinnott-Armstrong. - 4th ed. - San Diego : Harcourt Brace Jovanovich, 1991. - xv, 432 p. : ill ; 24 cm. Previous ed.: 1987. Includes bibliographical references and index. ISBN: 0155926721 : £18.00 LCCN: 90082128 Subjects--Topical Terms: Logic. LC Class. No.: BC50 / .F63 1991 Dewey Class. No.: 168