Não informado. (1908). The Mathematics Teacher. National Council of Teachers of Mathematics.
Chicago-Zitierstil (17. Ausg.)Não informado. The Mathematics Teacher. Reston, Va: National Council of Teachers of Mathematics, 1908.
MLA-Zitierstil (8. Ausg.)Não informado. The Mathematics Teacher. National Council of Teachers of Mathematics, 1908.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.