APA

Petroleum Extension Service. University of Texas, . (1976). The bit. Houston, Texas: Petroleum Extension Service ; International Association of Drilling Contractors, IADC.

Chicago

Petroleum Extension Service. University of Texas, . 1976. The bit. Houston, Texas: Petroleum Extension Service ; International Association of Drilling Contractors, IADC.

Harvard

Petroleum Extension Service. University of Texas, . (1976). The bit. Houston, Texas: Petroleum Extension Service ; International Association of Drilling Contractors, IADC.

MLA

Petroleum Extension Service. University of Texas, . The bit. Houston, Texas: Petroleum Extension Service ; International Association of Drilling Contractors, IADC. 1976.