APA (7th ed.) Citation

Schaaf, W. L. (1969). Basic concepts of elementary mathematics. John Wiley and Sons.

Chicago Style (17th ed.) Citation

Schaaf, William L. Basic Concepts of Elementary Mathematics. New York: John Wiley and Sons, 1969.

MLA (9th ed.) Citation

Schaaf, William L. Basic Concepts of Elementary Mathematics. John Wiley and Sons, 1969.