Gaya APA
Earth's history, structure and materials. (1980).
California:
William Kaufmann Inc..
Gaya Chicago
Earth's history, structure and materials.
.
California:
William Kaufmann Inc.,
1980.
Text.
Gaya MLA
Earth's history, structure and materials.
.
California:
William Kaufmann Inc.,
1980.
Text.
Gaya Turabian
Earth's history, structure and materials.
California:
William Kaufmann Inc.,
1980.
Print.