Gaya APA
Harbaugh, J, W.
(1968).
Stratigraphy and Geologic Time
.
Dubuque:
WM.C. Brown Company Publishers.
Gaya MLA
Harbaugh, John, W..
"Stratigraphy and Geologic Time".
Dubuque:
WM.C. Brown Company Publishers,
1968.
Text.