Cita APA (7a ed.)

Schoen, H. L., & Zweng, M. (1986). Estimation and mental computation: 1986 yearbook. National Council of Teachers of Mathematics.

Cita Chicago Style (17a ed.)

Schoen, Harold L., y Marilyn Zweng. Estimation and Mental Computation: 1986 Yearbook. Reston, Va: National Council of Teachers of Mathematics, 1986.

Cita MLA (9a ed.)

Schoen, Harold L., y Marilyn Zweng. Estimation and Mental Computation: 1986 Yearbook. National Council of Teachers of Mathematics, 1986.