APA (7th ed.) Citation

Schaaf, W. (1965). Basic concepts of elementary mathematics (2nd ed.). John Wiley.

Chicago Style (17th ed.) Citation

Schaaf, William. Basic Concepts of Elementary Mathematics. 2nd ed. New York: John Wiley, 1965.

MLA (9th ed.) Citation

Schaaf, William. Basic Concepts of Elementary Mathematics. 2nd ed. John Wiley, 1965.

Warning: These citations may not always be 100% accurate.