Gaya APA
Nugroho, A., Sriwanto, S.
(2002).
Geografi Regional Indonesia
.
Purwokerto:
FKIP UMP.
Gaya MLA
Nugroho, Anjar., Sriwanto, Sigid.
"Geografi Regional Indonesia".
Purwokerto:
FKIP UMP,
2002.
Text.