Cita APA (7th ed.)

SPEARS, H. (1951). Principles of teaching. Prentice-Hall.

Cita Chicago (17th ed.)

SPEARS, Harold. Principles of Teaching. New York: Prentice-Hall, 1951.

Cita MLA (9th ed.)

SPEARS, Harold. Principles of Teaching. Prentice-Hall, 1951.