Gaya APA
WHITTEN, J, L. et al
(1990).
Systems analysis and design methods
(
2nd.ed)
.
Tokyo, Japan:
Toppan.
Gaya MLA
WHITTEN, Jeffrey, L. et al.
"Systems analysis and design methods".
2nd.ed
Tokyo, Japan:
Toppan,
1990.
Buku.