Não informado. (1969). Bibliography and Index of Geology. Geological Society of America.
Chicagoスタイル(17版)引用形式Não informado. Bibliography and Index of Geology. Washington: Geological Society of America, 1969.
MLA(8版)引用形式Não informado. Bibliography and Index of Geology. Geological Society of America, 1969.
警告: この引用は必ずしも正確ではありません.