APA (7th ed.) Citation

Schaaf, W. L. (1969). Basic concepts of elementary mathematics (3. ed.). Wiley.

Chicago Style (17th ed.) Citation

Schaaf, William L. Basic Concepts of Elementary Mathematics. 3. ed. New York [u.a.]: Wiley, 1969.

MLA (9th ed.) Citation

Schaaf, William L. Basic Concepts of Elementary Mathematics. 3. ed. Wiley, 1969.