Gaya APA
Roger, U, D.
(2010).
Research methods for business.s2
(
Ed. 5)
.
unied kingdom:
Wiley Blakwell.
Gaya MLA
Roger, Umasekaran, Dan.
"Research methods for business.s2".
Ed. 5
unied kingdom:
Wiley Blakwell,
2010.
Buku PPS Manajemen.