Não informado. (1969). Environmental Health. Environmental Health Officers Association.
Chicagoスタイル(17版)引用形式Não informado. Environmental Health. London: Environmental Health Officers Association, 1969.
MLA(8版)引用形式Não informado. Environmental Health. Environmental Health Officers Association, 1969.
警告: この引用は必ずしも正確ではありません.