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North-Central North America (9th ed.), Boston: Houghton Mifflin, ISBN 0-395-91172-9 Vance, F R; J.R. Rowsey, J.S. Maclean and F.A. Switzer (1999), Wildflowers...8 KB (818 words) - 23:54, 26 July 2024
Illustrations by Roger Tory Peterson., Boston: Houghton Mifflin, pp. 164, ISBN 0-395-91172-9 "Archived copy" (PDF). Archived from the original (PDF) on 2013-04-13...3 KB (266 words) - 14:37, 5 May 2024
Guides. New York: Houghton Mifflin Company. p. 96: Heath Aster. ISBN 0-395-91172-9 – via Internet Archive. POWO (2019a). "Symphyotrichum ericoides (L.)...21 KB (1,274 words) - 00:36, 10 January 2024
