Taylor, R. J. (1990). Northwest weeds: The ugly and beautiful villains of fields, gardens, and roadsides. Mountain Press Pub. Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTaylor, Ronald J. Northwest Weeds: The Ugly and Beautiful Villains of Fields, Gardens, and Roadsides. Missoula, Mont.: Mountain Press Pub. Co., 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTaylor, Ronald J. Northwest Weeds: The Ugly and Beautiful Villains of Fields, Gardens, and Roadsides. Mountain Press Pub. Co., 1990.
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