Wilson, Mercedes Arzu <br/><br/>
The ovulation method of birth regulation 

 - Van Nostrand Reinhold Company, New York  1980 
 - xxii, 201p 
<br/><br/><label>ISBN: </label>0-442-29515-4 
<br/><br/><label>Dewey Class. No.: </label>613.943 Wil