Cita APA (7th ed.)
Butler, C. . H. (1965). The teaching of secondary mathematics (4a. ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Butler, Charles H. The Teaching of Secondary Mathematics. 4a. ed. McGraw-Hill, 1965.
Cita MLA (9th ed.)
Butler, Charles H. The Teaching of Secondary Mathematics. 4a. ed. McGraw-Hill, 1965.
Atenció: Aquestes cites poden no estar 100% correctes.