Gaya APA
Earth Science. (1983).
Ilinois:
Scott Foresman and Company.
Gaya Chicago
Earth Science.
.
Ilinois:
Scott Foresman and Company,
1983.
.
Gaya MLA
Earth Science.
.
Ilinois:
Scott Foresman and Company,
1983.
.
Gaya Turabian
Earth Science.
Ilinois:
Scott Foresman and Company,
1983.
.