Galván Anaya, F. (1967). National council of teachers of mathematics. Trillas.
Cita Chicago (17th ed.)Galván Anaya, Federico. National Council of Teachers of Mathematics. Trillas, 1967.
Cita MLA (9th ed.)Galván Anaya, Federico. National Council of Teachers of Mathematics. Trillas, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.