APA

Hofman H. O., . (1894). The metallurgy of lead and the desilverization of base bullion. New York and London: the scientific publishing co.

Chicago

Hofman Heinrich Oscar, . 1894. The metallurgy of lead and the desilverization of base bullion. New York and London: the scientific publishing co.

Harvard

Hofman H. O., . (1894). The metallurgy of lead and the desilverization of base bullion. New York and London: the scientific publishing co.

MLA

Hofman Heinrich Oscar, . The metallurgy of lead and the desilverization of base bullion. New York and London: the scientific publishing co. 1894.