Chandra Pakash Chugh, . (1988). Drilling Technology Handbook. New Delhi: OXFORD & IBH PUBLISHING CO.
Chandra Pakash Chugh, . 1988. Drilling Technology Handbook. New Delhi: OXFORD & IBH PUBLISHING CO.
Chandra Pakash Chugh, . Drilling Technology Handbook. New Delhi: OXFORD & IBH PUBLISHING CO. 1988.