 Carduus tenuiflorus USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 22 June 2009). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Theft from a single author is plagiarism. Theft from two is comparative study. Theft from three or more is research. (Unknown)
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