Gaya APA

Fitzgerald, J., Fitzgerald, A, F. (1987). Fundamentals of systems analysis : using structured analysiss and design techniques (3rd. ed.). New York: John Wiley and Sons.

Gaya MLA

Fitzgerald, Jemy., Fitzgerald, Andra, F.. "Fundamentals of systems analysis : using structured analysiss and design techniques". 3rd. ed. New York: John Wiley and Sons, 1987. Text.