Gaya APA
Weissler, J.
(1972).
Metal Statistics; 1961-1971 59th ed
.
Frankfurt:
Metallgesellschaft, A.G..
Gaya MLA
Weissler, Jacob.
"Metal Statistics; 1961-1971 59th ed".
Frankfurt:
Metallgesellschaft, A.G.,
1972.
Text.