Gaya APA
Pettijohn.F.J, .
(1975).
Sedimentary Rocks, 3rd Edition
(
3)
.
New York:
Harper & Row, Publishers.
Gaya MLA
Pettijohn.F.J, .
"Sedimentary Rocks, 3rd Edition".
3
New York:
Harper & Row, Publishers,
1975.
Text.