# Trajectories of Pure and Co-Occurring Internalizing and Externalizing Problems from Age 2 to Age 12: Findings from the NICHD Study of Early Child Care

> Research article (Digital Archive @ GSU, 2022) · cited 16× · AI/ML

**Wikidata**: [openalex:W2240663610](https://www.wikidata.org/wiki/openalex:W2240663610)  
**Source**: https://4ort.xyz/entity/trajectories-of-pure-and-co-occurring-internalizing-and-externalizing-problems-from-age-2-to-age-12-findings-from-the-ni