Spees, L. P., S. Potochnick, and K. M. Perreira. “The Academic Achievement of Limited English Proficient (LEP) Youth in New and Established Immigrant States: Lessons from the National Assessment of Educational Progress (NAEP)”. Education Policy Analysis Archives, vol. 24, Oct. 2016, p. 99, doi:10.14507/epaa.24.2130.