APA Citation

Steffensen, A. R., & Johnson, L. M. (1991). Developmental mathematics. New York: Harpercollins Publishers.

Chicago Style Citation

Steffensen, Arnold R., and L. Murphy Johnson. Developmental Mathematics. New York: Harpercollins Publishers, 1991.

MLA Citation

Steffensen, Arnold R., and L. Murphy Johnson. Developmental Mathematics. New York: Harpercollins Publishers, 1991.

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