Cita APA (7a ed.)

Engelhardt, N. L. (1941). Elementary school classrooms. Teachers college, Columbia university.

Cita Chicago Style (17a ed.)

Engelhardt, Nikolaus Louis. Elementary School Classrooms. New York: Teachers college, Columbia university, 1941.

Cita MLA (9a ed.)

Engelhardt, Nikolaus Louis. Elementary School Classrooms. Teachers college, Columbia university, 1941.