Gaya APA
Indrajit, R, E.
(2016).
Electronic Business Edisi 2
(
2)
.
yogyakarta:
Preinexus.
Gaya MLA
Indrajit, Richardus, Eko.
"Electronic Business Edisi 2".
2
yogyakarta:
Preinexus,
2016.
Text.