Gaya APA
VALACICH, J, S., GEORGE, J, F.
(2021).
Modern systems analysis and design
(
9th ed.)
.
Boston:
Pearson.
Gaya MLA
VALACICH, Joseph, S.., GEORGE, Joey, F..
"Modern systems analysis and design".
9th ed.
Boston:
Pearson,
2021.
Buku.