Schwarz, F. P. (1989). Minimizing errors in drill sampling for gold.
Cita Chicago Style (17a ed.)Schwarz, Frederick P. Minimizing Errors in Drill Sampling for Gold. 1989.
Cita MLA (8a ed.)Schwarz, Frederick P. Minimizing Errors in Drill Sampling for Gold. 1989.
Precaución: Estas citas no son 100% exactas.