Gaya APA
Ellis Eugene Underkoffler , dkk. ().
Merrill Earth Science (pertama).
New York:
Glencoe.
Gaya Chicago
Ellis Eugene Underkoffler , dkk.
Merrill Earth Science.
pertama
New York:
Glencoe,
.
Text.
Gaya MLA
Ellis Eugene Underkoffler , dkk.
Merrill Earth Science.
pertama
New York:
Glencoe,
.
Text.
Gaya Turabian
Ellis Eugene Underkoffler , dkk.
Merrill Earth Science.
pertama
New York:
Glencoe,
.
Print.