Gaya APA
Harben, P, W., Bates, R, L. (1990).
Industrial Minerals Geology & World Deposits .
London:
Metal Bulletin PLC..
Gaya MLA
Harben, Peter, W., Bates, Robert, L.
"Industrial Minerals Geology & World Deposits".
London:
Metal Bulletin PLC.,
1990.
Text.