Gaya APA
Joan, M., Aldo, S.
(2012).
Understanding Michael Porter
(
Edisi 1)
.
Yogyakarta:
Andi Offset.
Gaya MLA
Joan, Magretta., Aldo, Sahala.
"Understanding Michael Porter".
Edisi 1
Yogyakarta:
Andi Offset,
2012.
Text.