Gaya APA
Company, W, F, A. ().
Jurnal, Resource Library, Reading in the Earth Sciences (volume 2).
San Francisco:
W. H.Freeman and Company.
Gaya MLA
Company, W.H., Freeman, And.
"Jurnal, Resource Library, Reading in the Earth Sciences".
volume 2
San Francisco:
W. H.Freeman and Company,
.
Jurnal TP.