Gehrig, <br/><br/>
Foundations of Periodontics for the dental Hygenist  Textual Documents 

 - 3rd. 
 - Philadelphia  Lippincott Williams & Wilkins  2011 
 - 321:  27*21.5. 
<br/><br/><label>ISBN: </label>978-1-60547-573-8   
<br/><br/><label>Subjects--Index Terms: </label>Periodontology 
<br/><br/><label>Dewey Class. No.: </label>617.632  / GEH