Beasley, Brenda M. Understanding EKGs : a practical approach / Brenda M. Beasley - 2nd ed. - Upper Saddle River, N. J. : Prentice Hall, 2003 - xv, 252 p. : ill . ; 28 cm. ISBN: 0130452157 RM180.90 Subjects--Topical Terms: Electrocardiography National Library of Medicine Call No.: WG140