Rush, T., Gamon, J., & Ponzetti, J. (1999). Field guide to Washington's rare plants. Washington State Dept. of Natural Resources ; Spokane District, Bureau of Land Management.
Chicago Style (17th ed.) CitationRush, Tracy, John Gamon, and Jeanne Ponzetti. Field Guide to Washington's Rare Plants. [Olympia] : [Spokane]: Washington State Dept. of Natural Resources ; Spokane District, Bureau of Land Management, 1999.
MLA (8th ed.) CitationRush, Tracy, et al. Field Guide to Washington's Rare Plants. Washington State Dept. of Natural Resources ; Spokane District, Bureau of Land Management, 1999.
Warning: These citations may not always be 100% accurate.