Washington State University. Cooperative Extension & United States. Department of Agriculture. (2001). Perennials for the Inland Northwest (Rev. Sept. 2001.). Washington State University Cooperative Extension ; U.S. Dept. of Agriculture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington State University. Cooperative Extension और United States. Department of Agriculture. Perennials for the Inland Northwest. Rev. Sept. 2001. [Pullman, Wash.] : [Washington, D.C.]: Washington State University Cooperative Extension ; U.S. Dept. of Agriculture, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington State University. Cooperative Extension और United States. Department of Agriculture. Perennials for the Inland Northwest. Rev. Sept. 2001. Washington State University Cooperative Extension ; U.S. Dept. of Agriculture, 2001.