Hadnagy, Christopher. Unmasking the social engineer : the human element of security / Christopher Hadnagy, Dr. Paul Ekman. - 1 online resource (258 pages) : color illustrations, photographs Includes index. ISBN: 9781118608654 (e-book) 9781118899564 (e-book) Subjects--Topical Terms: Christian sociology.Social problems. Index Terms--Genre/Form: Electronic books. LC Class. No.: BT738 / .H336 2014eb Dewey Class. No.: 005.8