Gaya APA

Valacich, J, S., A, I, G, J, F, I, H, J. (2009). Essentials of systems analysis and design . New Jersey: .

Gaya MLA

Valacich, Joseph, S., A, I., George,, Joey, F, II., Hoffer,, Jeffrey. "Essentials of systems analysis and design". New Jersey: , 2009. .