Não informado. (1970). Geodex Retrieval System for Geotechnical Abstracts. Geodex International.
Chicagoスタイル(17版)引用形式Não informado. Geodex Retrieval System for Geotechnical Abstracts. Sonoma, Calif: Geodex International, 1970.
MLA(8版)引用形式Não informado. Geodex Retrieval System for Geotechnical Abstracts. Geodex International, 1970.
警告: この引用は必ずしも正確ではありません.