Cita APA (7th ed.)

National Society for the Study of Education (U.S.). Committee on the Grouping of Pupils & Whipple, G. M. (1936). The Grouping of pupils. National Society for the Study of Education : Public School Publishing Co..

Cita Chicago (17th ed.)

National Society for the Study of Education (U.S.). Committee on the Grouping of Pupils i Guy Montrose Whipple. The Grouping of Pupils. Bloomington, Ill.: National Society for the Study of Education : Public School Publishing Co., 1936.

Cita MLA (8th ed.)

National Society for the Study of Education (U.S.). Committee on the Grouping of Pupils i Guy Montrose Whipple. The Grouping of Pupils. National Society for the Study of Education : Public School Publishing Co., 1936.