APA Style
Ojakangas, Richard W.. (1991).
Schaum's : Theory and problems of introductory geology .
New York:
McGraw-Hill Book Company.
Chicago Style
Ojakangas, Richard W..
Schaum's : Theory and problems of introductory geology.
New York:
McGraw-Hill Book Company,
1991.
Buku Teks.
MLA Style
Ojakangas, Richard W..
Schaum's : Theory and problems of introductory geology.
New York:
McGraw-Hill Book Company,
1991.
Buku Teks.
Turabian Style
Ojakangas, Richard W..
Schaum's : Theory and problems of introductory geology.
New York:
McGraw-Hill Book Company,
1991.
Buku Teks.