Gaya APA
Somantri, L., Christine,Dkk, .
(2011).
advance learning geography
.
Bandung:
PT.Grafindo Media Pratama.
Gaya MLA
Somantri, Lili., Christine,Dkk, .
"advance learning geography".
Bandung:
PT.Grafindo Media Pratama,
2011.
Text.