The VL2 Early Education Longitudinal Study: Rationale, methods and participant characteristics.
Allen, T., Morere, D., Clark, M.D., & Murphy, L. (2015). The VL2 Early Education Longitudinal Study: Rationale, methods and participant characteristics. Retrieved from website, http://vl2.gallaudet.edu/files/2914/1045/8608/EELS_Methods_Paper.pdf