Não informado. (1931). Mineralogist. Oregon Agate and Mineral Society.
Chicagoスタイル(17版)引用形式Não informado. Mineralogist. Portland, Ore: Oregon Agate and Mineral Society, 1931.
MLA(8版)引用形式Não informado. Mineralogist. Oregon Agate and Mineral Society, 1931.
警告: この引用は必ずしも正確ではありません.