Cita APA (7th ed.)

Spears, H. (1949). Some principles of teaching. Prentice-Hall.

Cita Chicago (17th ed.)

Spears, Harold. Some Principles of Teaching. New York: Prentice-Hall, 1949.

Cita MLA (9th ed.)

Spears, Harold. Some Principles of Teaching. Prentice-Hall, 1949.