Não informado. (1970). Environmental quality. Council on Environmental Quality, Executive Office of the President.
Chicago-Zitierstil (17. Ausg.)Não informado. Environmental Quality. Washington: Council on Environmental Quality, Executive Office of the President, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. Environmental Quality. Council on Environmental Quality, Executive Office of the President, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.