Gaya APA

Friedman, F, L., Koffan, E, B. (1982). Peroblem Solving and Structured Programming in Watfiv . Canada: Addison-Wesley Publishing Company.

Gaya MLA

Friedman, Frank, L.., Koffan, Elliot, B.. "Peroblem Solving and Structured Programming in Watfiv". Canada: Addison-Wesley Publishing Company, 1982. Text.