Gaya APA
W.MONTGOMERY, C. (2011).
Environmental Geology: Ninth Edition .
Bandung:
Professor Emerita Nothern lllinois University.
Gaya MLA
W.MONTGOMERY, CARLA.
"Environmental Geology: Ninth Edition".
Bandung:
Professor Emerita Nothern lllinois University,
2011.
Textbook.