Gilkey, H. M. (1957). Weeds of the Pacific Northwest. Oregon State College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGilkey, Helen M. Weeds of the Pacific Northwest. [Corvallis]: Oregon State College, 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGilkey, Helen M. Weeds of the Pacific Northwest. Oregon State College, 1957.
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