Onopordum acanthium L

Chicago citation style
Onopordum acanthium L. 21 May 1939. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12980994&repo=DPLA. (Accessed October 21, 2018.)
APA citation style
(21 May 1939) Onopordum acanthium L. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12980994&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12980994&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.