Vogl, K., & Preckel, F. (2014). Full-Time Ability Grouping of Gifted Students. Gifted Child Quarterly, 58 (1), 51-68.
Robinson, J. P. (2008). Evidence of a Differential Effect of Ability Grouping on the Reading Achievement Growth of Language-Minority Hispanics. Educational Evaluation and Policy Analysis, 30 (2), 141-180.