Gaya APA
Irawan, J, E, S.
(1989).
Foundations of business systems
(
1)
.
perpustakaan:
Mahkamah Agung RI.
Gaya MLA
Irawan, Johanes, E,, SH.,M.Hum.
"Foundations of business systems".
1
perpustakaan:
Mahkamah Agung RI,
1989.
Text.