Não informado. (1908). The Mathematics Teacher. National Council of Teachers of Mathematics.
Citação do estilo Chicago (17ª ed.)Não informado. The Mathematics Teacher. Reston, Va: National Council of Teachers of Mathematics, 1908.
Citação MLA (8ª ed.)Não informado. The Mathematics Teacher. National Council of Teachers of Mathematics, 1908.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.