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?.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Washington (State). Forest Practices Board, Washington (State). Forest Practices Board. Spotted Owl Science Advisory Group, và Eric Hanson. Spotted Owl Habitat in Washington: A Report to the Washington Forest Practices Board. [Olympia, Wash.?: Washington Forest Practices Board?, 1993.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Washington (State). Forest Practices Board, et al. Spotted Owl Habitat in Washington: A Report to the Washington Forest Practices Board. Washington Forest Practices Board?, 1993.