Audubon Society of Portland, Davis, J., Pugh, E., Ward, J., & Ward, W. (1988). Familiar bird songs of the Northwest. Portland Audubon Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAudubon Society of Portland, James Davis, Eleanor Pugh, Jean Ward, और William Ward. Familiar Bird Songs of the Northwest. Portland, Or.: Portland Audubon Society, 1988.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAudubon Society of Portland, et al. Familiar Bird Songs of the Northwest. Portland Audubon Society, 1988.
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