Cita APA

Berger, E. J., & Johnson, D. A. (1959). A Guide to the use and procurement of teaching aids for mathematics. Washington: National Council of Teachers of Mathematics.

Citación estilo Chicago

Berger, Emil J., y Donovan A. Johnson. A Guide to the Use and Procurement of Teaching Aids for Mathematics. Washington: National Council of Teachers of Mathematics, 1959.

Cita MLA

Berger, Emil J., y Donovan A. Johnson. A Guide to the Use and Procurement of Teaching Aids for Mathematics. Washington: National Council of Teachers of Mathematics, 1959.