Clifford, R. M., Bryant, D. M., & Early, D. M. 2005 Citation Clifford, R. M., Bryant, D. M., & Early, D. M. (2005). What we know about pre-K programs. Principal, 85(1), 20-24. Author Profile(s) Donna M. Bryant Area(s) of WorkEarly Care and Education & Pre-K EducationTypeJournal Articles