APA (7e ed.) Bronvermelding

(1977). Positive displacement downhole and motor for rotary drilling rigs installation and maintenance [slaid]. Austin, Tex. : Petroleum Extension Service, The University of Texas at Austin.

Chicago (17e ed.) Bronvermelding

Positive Displacement Downhole and Motor for Rotary Drilling Rigs Installation and Maintenance [slaid]. Austin, Tex. : Petroleum Extension Service, The University of Texas at Austin, 1977.

MLA (9e ed.) Bronvermelding

Positive Displacement Downhole and Motor for Rotary Drilling Rigs Installation and Maintenance [slaid]. Austin, Tex. : Petroleum Extension Service, The University of Texas at Austin, 1977.