Não informado. (1990). Environmental Technology. Selper Publications.
Chicagoスタイル(17版)引用形式Não informado. Environmental Technology. London: Selper Publications, 1990.
MLA(8版)引用形式Não informado. Environmental Technology. Selper Publications, 1990.
警告: この引用は必ずしも正確ではありません.