Chou, Henry CCNA : cisco certified network associate wireless study guide (exam 640-721)/ Henry Chou - United States of America : McGraw-Hill Companies, 2010. - ix, 527 pages : images, illustrations; 23 cm. + 1 computer disc Includes Index. ISBN: 9780071701525 Subjects--Topical Terms: Telecommunications engineers --Certifications.Computer networks--Examinations. Dewey Class. No.: 384.092 / C457c