Não informado. (1971). Environmental data service. Environmental Data Service.
Chicagoスタイル(17版)引用形式Não informado. Environmental Data Service. Rockville, Md: Environmental Data Service, 1971.
MLA(8版)引用形式Não informado. Environmental Data Service. Environmental Data Service, 1971.
警告: この引用は必ずしも正確ではありません.