Ryan, Terry. Outwitting dogs / Terry Ryan and Kirsten Mortensen. - Guilford, Conn. : Lyon's Press, c2004. - xii,275 p. ; 21 cm. Includes bibliographical references (p. 268-269). ISBN: 1592282431 (trade pbk.) Subjects--Topical Terms: Dogs--Training LC Class. No.: SF431 Dewey Class. No.: 636.7/0887