van der Valk, J C <br/><br/>
Quantitative genetic analysis of internalising and externalising problems in a large sample of 3-year-old twins.  [electronic resource] 

 -  Twin research : the official journal of the International Society for Twin Studies  May 1998 
 - 25-33 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Twin Study 
<br/><br/><label>ISSN: </label>1369-0523 
<br/><br/><label>Standard No.: </label>10.1375/136905298320566456  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child Behavior<br/>Child Behavior Disorders--genetics<br/>Child, Preschool<br/>Diseases in Twins--genetics<br/>Female<br/>Genetics, Behavioral<br/>Humans<br/>Internal-External Control<br/>Male<br/>Models, Genetic<br/>Models, Psychological<br/>Twins--psychology