An examination of the effect of eliciting and noneliciting questions during shared storybook reading on children's expressive and receptive knowledge of target words and on two measures of vocabulary with 45 children enrolled in monolingual Head Start classrooms and an examination of the effect of eliciting and noneliciting questions during storybook reading and parental home language use on expressive and receptive Spanish and English vocabulary of 28 children enrolled in English-Spanish bilingual Head Start classrooms