Cita APA (7th ed.)
Willoughby, S. S. (1967). Contemporary teaching of secondary school mathematics. Wiley.
Cita Chicago (17th ed.)
Willoughby, Stephen S. Contemporary Teaching of Secondary School Mathematics. New York: Wiley, 1967.
Cita MLA (9th ed.)
Willoughby, Stephen S. Contemporary Teaching of Secondary School Mathematics. Wiley, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.