Gaya APA
Govett, G, J, S., Govett, M, H. (1976).
World Mineral Supplies Assessment and Perspective .
Amsterdam:
Elsevier.
Gaya MLA
Govett, G., J., S.., Govett, M., H..
"World Mineral Supplies Assessment and Perspective".
Amsterdam:
Elsevier,
1976.
Textbook.