APA (7th ed.) Citation

Billings, K., & Moursund, D. G. (1979). Problem solving with calculators. Dilithium Press.

Chicago Style (17th ed.) Citation

Billings, Karen, and David G. Moursund. Problem Solving with Calculators. Portland, Or.: Dilithium Press, 1979.

MLA (9th ed.) Citation

Billings, Karen, and David G. Moursund. Problem Solving with Calculators. Dilithium Press, 1979.