Gaya APA

MINES, B, O. (1970). MINERAL YEARBOOK METALS, MINERALS, AND FUELS (VOLUME I). USA: UNITED STATES DEPARTMENT OF TE INTRIOR.

Gaya MLA

MINES, BUREAU, OF. "MINERAL YEARBOOK METALS, MINERALS, AND FUELS". VOLUME I USA: UNITED STATES DEPARTMENT OF TE INTRIOR, 1970. Text.