Johnson, S C <br/><br/>
Why dogs have puppies and cats have kittens: the role of birth in young children's understanding of biological origins.  [electronic resource] 

 -  Child development  Jun 1997 
 - 404-19 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. 
<br/><br/><label>ISSN: </label>0009-3920 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Age Factors<br/>Animal Population Groups<br/>Animals<br/>Child<br/>Child Development<br/>Child, Preschool<br/>Cognition<br/>Female<br/>Humans<br/>Labor, Obstetric<br/>Pregnancy<br/>Psychology, Child