APA ציטוט

P & V (Mining & Engineering) Ltd. (1968). Rock drilling data. [s.n.

Chicago Style (17th ed.) Citation

P & V (Mining & Engineering) Ltd. Rock Drilling Data. Dronfield, Engl: [s.n, 1968.

ציטוט MLA

P & V (Mining & Engineering) Ltd. Rock Drilling Data. [s.n, 1968.