Não informado. (1908). The Mathematics Teacher. National Council of Teachers of Mathematics.
Cita Chicago Style (17a ed.)Não informado. The Mathematics Teacher. Reston, Va: National Council of Teachers of Mathematics, 1908.
Cita MLA (8a ed.)Não informado. The Mathematics Teacher. National Council of Teachers of Mathematics, 1908.
Precaución: Estas citas no son 100% exactas.