# Concern Over Internal, External, and Incidence Validity in Studies of Child-Care Quantity and Externalizing Behavior Problems

> Research article (Child Development Perspectives, 2017) · cited 35× · AI/ML

**Wikidata**: [openalex:W2583064835](https://www.wikidata.org/wiki/openalex:W2583064835)  
**Source**: https://4ort.xyz/entity/concern-over-internal-external-and-incidence-validity-in-studies-of-child-care-quantity-and-externalizing-behavior-probl