Wijayratne, U. C., & Pyke, D. A. (2009). Investigating seed longevity of big sagebrush (Artemisia tridentata). U.S. Geological Survey.
Chicago Style (17th ed.) CitationWijayratne, Upekala C., and David A. Pyke. Investigating Seed Longevity of Big Sagebrush (Artemisia Tridentata). Reston, Va.: U.S. Geological Survey, 2009.
MLA (9th ed.) CitationWijayratne, Upekala C., and David A. Pyke. Investigating Seed Longevity of Big Sagebrush (Artemisia Tridentata). U.S. Geological Survey, 2009.
Warning: These citations may not always be 100% accurate.