Wilson, Mercedes Arzú. <br/><br/>
The ovulation method of birth regulation :  the latest advances for achieving or postponing pregnancy--naturally / 
Mercedes Arzú Wilson. 
 - New York :  Van Nostrand Reinhold,  1980. 
 - xxii, 201 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0442295154 
<br/><br/><label>LCCN: </label>79015167  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural family planning--Ovulation method.<br/>Rhythm methods.
<br/><br/><label>Dewey Class. No.: </label>613.9/434