APA
(1951). Copper: its ores, minig and extraction. [s.l.]: [s.n.].
Chicago
1951. Copper: its ores, minig and extraction. [s.l.]: [s.n.].
Harvard
(1951). Copper: its ores, minig and extraction. [s.l.]: [s.n.].
MLA
Copper: its ores, minig and extraction. [s.l.]: [s.n.]. 1951.
