The etiology of observed negative emotionality from 14 to 24 months oleh Soo H Rhee, Soo H Rhee, Robin P Corley, Naomi P Friedman, John K Hewitt, John K Hewitt, Laura K Hink, Laura K Hink, Daniel P Johnson, Daniel P Johnson, JoAnn eRobinson, Ashley K Smith, Ashley K Smith, Susan E Young