Piasta, S.B., Justice, S. B., Justice, L. M., McGinty, A. S., & Kaderavek, J. N. (2012). Increasing young children's contact with print during shared reading: Longitudinal effects on literacy achievement. Child Development, 83(3), 810-820.
This study examined the impact of Project STAR (Sit Together and Read) on literacy skills of preschool students. Project STAR is a program in which teachers read books aloud to their students and use instructional techniques designed to encourage children to pay attention to print within storybooks. Results of the study indicated a causal relationship between early print knowledge and later literacy skills.