APA (7th ed.) Citation

Smith, D. E. (1969). Number stories of long ago. National Council of Teachers of Mathematics.

Chicago Style (17th ed.) Citation

Smith, David Eugene. Number Stories of Long Ago. Washington, D.C.: National Council of Teachers of Mathematics, 1969.

MLA (9th ed.) Citation

Smith, David Eugene. Number Stories of Long Ago. National Council of Teachers of Mathematics, 1969.