Arbor Day Foundation, “American Sweetgum Liquidambar styraciflua,” Tree Guide, Accessed April 19, 2016.
B.W. Wells Association, “News from Rockcliff Farm: Spring Flowers of the Sweet Gum Tree – Liquidambar styraciflua,” April 7, 2016, https://bwwellsassociation.wordpress.com/2016/04/07/spring-flowers-of-th….
Carolina Nature, “Sweetgum,” Accessed April 25, 2016 http://www.carolinanature.com/trees/list.html.
Cathy Heidenreich, “Sweetgum, Confederate Native Becoming Yankee Favorite,” Geneva Arboretum Association, New York State Agricultural Experiment Station, Accessed April 22, 2016 http://www.hort.cornell.edu/bjorkman/lab/arboretum/trees/sweetgum.html
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Edward F. Gilman and Dennis G. Watson, “Liquidambar styraciflua: Sweetgum,” University of Florida IFAS Extension, Accessed April 27, 2016 https://edis.ifas.ufl.edu/st358.
Lady Bird Johnson Wildflower Center, “Liquidambar styraciflua,” Native Plant Database, The University of Texas at Austin, Accessed at April 19, 2016 http://www.wildflower.org/plants/result.php?id_plant=LIST2.
Missouri Botanical Garden Plant Finder, “Liquidambar styraciflua,” Accessed April 20, 2016 http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c116.
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Paul P. Kormanik, “Sweetgum,” USDA Forest Services, Northeastern Area State and Private Forestry, Accessed April 27, 2016 http://www.na.fs.fed.us/pubs/silvics_manual/volume_2/liquidambar/styraci…
Ray R. Hicks, Jr. and M. Reines, “The Phenology of Sweetgum Liquidambar Styraciflua,” Journal Series Paper No. 102 of University of Georgia College of Agriculture Experiment Stations.
The Ohio State University College of Food Agricultural, and Environmental Sciences, PocketGardener, “Liquidambar styraciflua,” Accessed April 27, 2016, http://hvp.osu.edu/pocketgardener/source/description/li_iflua.html
Virginia Tech Department of Forest Resources and Environmental Conservation, “Sweetgum,” Accessed April 27, 2016 http://dendro.cnre.vt.edu/dendrology/syllabus/factsheet.cfm?ID=53.