Dyfyniad APA

(1996). Drilling: The manual of methods , applications, and management (4th ed.). CRC , Lewis.

Dyfyniad Arddull Chicago

Drilling: The Manual of Methods , Applications, and Management. 4th ed. New York: CRC , Lewis, 1996.

Dyfyniad MLA

Drilling: The Manual of Methods , Applications, and Management. 4th ed. CRC , Lewis, 1996.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.