TY - JOUR A1 - Gortmaker, S. A1 - Kagan, J. A1 - Caspi, A. A1 - Silva, P. T1 - Daylength during pregnancy and shyness of children: Results from Northern and Southern hemisphere Y1 - 1997 DO - 10.1002/(SICI)1098-2302(199709)31:2<107::AID-DEV3>3.0.CO;2-O JF - Developmental Psychobiology VL - 31 IS - 2 ER -