Washington (State). Forest Practices Board, Washington (State). Forest Practices Board. Spotted Owl Science Advisory Group, & Hanson, E. (1993). Spotted owl habitat in Washington: A report to the Washington Forest Practices Board. Washington Forest Practices Board?.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington (State). Forest Practices Board, Washington (State). Forest Practices Board. Spotted Owl Science Advisory Group, और Eric Hanson. Spotted Owl Habitat in Washington: A Report to the Washington Forest Practices Board. [Olympia, Wash.?: Washington Forest Practices Board?, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington (State). Forest Practices Board, et al. Spotted Owl Habitat in Washington: A Report to the Washington Forest Practices Board. Washington Forest Practices Board?, 1993.