APA
(1949). Copper conductors for overhead lines. [s.l.]: [s.n.].
Chicago
1949. Copper conductors for overhead lines. [s.l.]: [s.n.].
Harvard
(1949). Copper conductors for overhead lines. [s.l.]: [s.n.].
MLA
Copper conductors for overhead lines. [s.l.]: [s.n.]. 1949.