Cotton, K., & Savard, W. G. (1981). Instructional Grouping: Group Size. Research on School Effectiveness Project: Topic Summary Report.
Citazione stile Chigago Style (17a edizione)Cotton, Kathleen, e W. G. Savard. Instructional Grouping: Group Size. Research on School Effectiveness Project: Topic Summary Report. 1981.
Citatione MLA (9a ed.)Cotton, Kathleen, e W. G. Savard. Instructional Grouping: Group Size. Research on School Effectiveness Project: Topic Summary Report. 1981.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.