Gaya APA
PARKS, R, D. (1972).
EXAMINATION AND VALUATION OF MINERAL PROPERTY (FOURTH EDITION).
USA:
WESLEY PUBLISHING COMPANY.
Gaya MLA
PARKS, ROLAND, D..
"EXAMINATION AND VALUATION OF MINERAL PROPERTY".
FOURTH EDITION
USA:
WESLEY PUBLISHING COMPANY,
1972.
Textbook.