APA (7th ed.) Citation

Spiers, J. D. (1931). Mining methods and costs at Central-Eureka mine, Amador County, Calif. [publisher not identified].

Chicago Style (17th ed.) Citation

Spiers, James Davis. Mining Methods and Costs at Central-Eureka Mine, Amador County, Calif. Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Spiers, James Davis. Mining Methods and Costs at Central-Eureka Mine, Amador County, Calif. [publisher not identified], 1931.