Gilkey, H. M. (1945). Northwestern American plants. Oregon State College ; College Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGilkey, Helen M. Northwestern American Plants. Corvallis, Or.: Oregon State College ; College Press, 1945.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGilkey, Helen M. Northwestern American Plants. Oregon State College ; College Press, 1945.
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