Cita APA (7th ed.)

Thelen, H. A. (1967). Classroom grouping for teachability. Wiley.

Cita Chicago (17th ed.)

Thelen, Herbert Arnold. Classroom Grouping for Teachability. New York: Wiley, 1967.

Cita MLA (9th ed.)

Thelen, Herbert Arnold. Classroom Grouping for Teachability. Wiley, 1967.