A History of Ability Grouping for Reading Instruction in the United States from 1920 to 1980by Lynne D. Lech1982
A Survey of Methods of Ability Grouping in Reading in Selected Elementary Schools of Washington Stateby David Paul Granlund1966
A Correlational Study to Validate the Criteria Employed to Establish Ability Grouping in the Seventh Grade at Roosevelt Junior High School, Rockford, Illinoisby David Anton Pennock1962