Ahlgren, C. E. (1968). Breeding for resistance to white pine blister rust. Quetico-Superior Wilderness Research Center.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAhlgren, C. E. Breeding for Resistance to White Pine Blister Rust. Ely, Minn.: Quetico-Superior Wilderness Research Center, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAhlgren, C. E. Breeding for Resistance to White Pine Blister Rust. Quetico-Superior Wilderness Research Center, 1968.
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