Article InformationAuthors: Koegel, L. K., Camarata, S. M., Valdez-Menchaca, M., & Koegel, R. L. Year: 1997Publication: American Journal on Mental RetardationVolume: 102Issue: 4Pages: 346-357DOI: 10.1352/0895-8017(1998)102<0346:SGOQBC>2.0.CO;2 Final Quality and Data Extraction DecisionsAge: 36-71.9 months (3-5.9 years)Domains: CommunicationIntervention: Reinforcement