Não informado. (2022). US Forest Service Resource Bulletin NC. North Central Forest Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. US Forest Service Resource Bulletin NC. Saint Paul, Minn: North Central Forest Experiment Station, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. US Forest Service Resource Bulletin NC. North Central Forest Experiment Station, 2022.
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