Gaya APA
SERIES, S, W, M. (1969).
SURFACE MINING .
United State of America:
THE AMERICAN INSTITUE OF MINING METALLURGICAL.
Gaya MLA
SERIES, SEELEY, W., MUDD.
"SURFACE MINING".
United State of America:
THE AMERICAN INSTITUE OF MINING METALLURGICAL,
1969.
Textbook.