Gaya APA

Koffman, E, B., Friedman, F, L. (1979). Problem Solving and Structuring Programming in Basic . Philippines: Addison-Wesley Publishing.

Gaya MLA

Koffman, Elliot, B.., Friedman, Frank, L.. "Problem Solving and Structuring Programming in Basic". Philippines: Addison-Wesley Publishing, 1979. Texts.