Gaya APA
Bronto, S. (1997).
Guide Book for Field Excursion on The Southern Flank of Merapi Volcano .
Yogyakarta:
VSI UNESCO.
Gaya MLA
Bronto, Sutikno.
"Guide Book for Field Excursion on The Southern Flank of Merapi Volcano".
Yogyakarta:
VSI UNESCO,
1997.
Text.