CarlbergC.KavaleK. (1980). The efficacy of special versus regular class placement for exceptional children: A meta-analysis. The Journal of Special Education, 14, 295–309.
2.
GeorgeP. (1992). How to untrack your school.Alexandria, VA: Association for Supervision and Curriculum Development.
3.
WestbergK.L.ArchambaultF.S.Jr.DobynsS. M.SalvinT.J. (1993). The classroom practices observation study. Journal for the Education of the Gifted, 16 (2), 120–146.
4.
YsseldykeJ.ChristensonS. (1987). The instructional environment scale: A comprehensive methodology for assessing an individual student's instruction.Austin: PRO-ED.