Gaya APA
Santoso, S., Bolstad, P. (2016).
Gis fundamentals :A first text on geographic information systems .
First Printing March:
XanEdu.
Gaya MLA
Santoso, Singgih., Bolstad, Paul.
"Gis fundamentals :A first text on geographic information systems".
First Printing March:
XanEdu,
2016.
Text.