Pawlak, Elizabeth A. <br/><br/>
Essentials of periodontics 
Elizabeth A. Pawlak, Philip M. Hoag. 
 - 3rd  ed. 
 - New Delhi  Jaypeeearborn  1991 
 - xv, 217p. 
<br/><br/><label>Dewey Class. No.: </label>617.632  / P27E