Sharpe, W. F., & Jacob, N. L. (1971). Basic: An introduction to computer programming using the Basic language (Rev. ed.). Free Press.

Sharpe, William F., and Nancy L. Jacob. Basic: An Introduction to Computer Programming Using the Basic Language. Rev. ed. New York: Free Press, 1971.

Sharpe, William F., and Nancy L. Jacob. Basic: An Introduction to Computer Programming Using the Basic Language. Rev. ed. Free Press, 1971.