Cita APA (7th ed.)

National Council of Teachers of Mathematics. (1926). Yearbook. National Council of Teachers of Mathematics.

Cita Chicago (17th ed.)

National Council of Teachers of Mathematics. Yearbook. [Place of publication not identified]: National Council of Teachers of Mathematics, 1926.

Cita MLA (9th ed.)

National Council of Teachers of Mathematics. Yearbook. National Council of Teachers of Mathematics, 1926.