Conover, Mary Boudreau,  1931- <br/><br/>
Understanding electrocardiography :  arrhythmias and the 12-lead ECG / 
Mary Boudreau Conover. 
 - 6th ed. 
 - St. Louis :  Mosby Year Book,  c1992. 
 - xvi, 464 p. :  ill. ;  26 cm.