Cita APA (7a ed.)

Irion, T. W. E. (1925). Comprehension difficulties of ninth grade students in the study of Literature. Columbia University.

Cita Chicago Style (17a ed.)

Irion, Theo W E. Comprehension Difficulties of Ninth Grade Students in the Study of Literature. New York: Columbia University, 1925.

Cita MLA (9a ed.)

Irion, Theo W E. Comprehension Difficulties of Ninth Grade Students in the Study of Literature. Columbia University, 1925.