“September: Plan for Fall.” California Native Gardening: A Month-by-Month Guide, by HELEN POPPER, 1st ed., University of California Press, Berkeley; Los Angeles; London, 2012, pp. 163–171, www.jstor.org/stable/10.1525/j.ctt1pp46t.15. Accessed 15 Apr. 2021.
POPPER, H. (2012). September: Plan for Fall. In California Native Gardening: A Month-by-Month Guide (pp. 163-171). Berkeley; Los Angeles; London: University of California Press. Retrieved April 15, 2021, from http://www.jstor.org/stable/10.1525/j.ctt1pp46t.15
POPPER, HELEN. "September: Plan for Fall." In California Native Gardening: A Month-by-Month Guide, 163-71. Berkeley; Los Angeles; London: University of California Press, 2012. Accessed April 15, 2021. http://www.jstor.org/stable/10.1525/j.ctt1pp46t.15.
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