Cita APA (7th ed.)

National Council of Teachers of Mathematics & Osborne, A. (1977). An in-service handbook for mathematics education. National Council of Teachers of Mathematics.

Cita Chicago (17th ed.)

National Council of Teachers of Mathematics i Alan Osborne. An In-service Handbook for Mathematics Education. Reston, Va.: National Council of Teachers of Mathematics, 1977.

Cita MLA (8th ed.)

National Council of Teachers of Mathematics i Alan Osborne. An In-service Handbook for Mathematics Education. National Council of Teachers of Mathematics, 1977.