Gaya APA
Geology : An Introduction to Earth-History. (1958).
:
.
Gaya Chicago
Geology : An Introduction to Earth-History.
.
:
,
1958.
Text.
Gaya MLA
Geology : An Introduction to Earth-History.
.
:
,
1958.
Text.
Gaya Turabian
Geology : An Introduction to Earth-History.
:
,
1958.
Print.