Citazione APA

United States. Census Office, Emmons, S. F., & Becker, G. F. (1885). Statistics and technology of the precious metals. GPO.

Stile di citazione Chicago

United States. Census Office, Samuel Franklin Emmons, e George F. Becker. Statistics and Technology of the Precious Metals. Washington: GPO, 1885.

Citazione MLA

United States. Census Office, et al. Statistics and Technology of the Precious Metals. GPO, 1885.