Urban, K. (1972). Spring wildflowers of the Blue Mountains. Blue Mountain Community College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUrban, Karl. Spring Wildflowers of the Blue Mountains. Pendleton, Or.: Blue Mountain Community College, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUrban, Karl. Spring Wildflowers of the Blue Mountains. Blue Mountain Community College, 1972.
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