Louis Harris and Associates. (1970). The Public's view of environmental problems in the state of Washington. s.n.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLouis Harris and Associates. The Public's View of Environmental Problems in the State of Washington. [New York?: s.n.], 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLouis Harris and Associates. The Public's View of Environmental Problems in the State of Washington. s.n.], 1970.
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