Media type: E-Article Title: Effect of first‐grade classroom environment on shy behavior, aggressive behavior, and concentration problems Contributor: Werthamer-Larsson, Lisa; Kellam, Sheppard; Wheeler, Leonard imprint: Wiley, 1991 Published in: American Journal of Community Psychology Language: English DOI: 10.1007/bf00937993 ISSN: 0091-0562; 1573-2770 Keywords: Public Health, Environmental and Occupational Health ; Applied Psychology ; Health (social science) Origination: Footnote: