Gaya APA
VALACICH, J, S., GEORGE, J, F.
(2017).
Modern systems analysis and design
(
8th ed.)
.
Boston:
Pearson.
Gaya MLA
VALACICH, Joseph, S.., GEORGE, Joey, F..
"Modern systems analysis and design".
8th ed.
Boston:
Pearson,
2017.
Buku.