Williams, Roger L. (1988). "Gerard and Jaume: Two Neglected Figures in the History of Jussiaean Classification (Parts One and Two)". Taxon . 37 (1): 2– 34. doi : 10.2307/1220932 . JSTOR 1220932 .
Williams, Roger L. (1988). 「ジェラールとジャウメ:ユッシア分類の歴史における見過ごされてきた二人の人物(第3部)」. Taxon . 37 (2): 233–271 . doi : 10.2307/1222135 . JSTOR 1222135 .
Williams, Roger L. (1997). The Letters of Dominique Chaix, Botanist-Curé (International Archives of the History of Ideas Archives internationales d'histoire des idées). Springer. ISBN978-9401063104.
Williams, Roger L. (2001). Botanophilia in Eighteenth-Century France: The Spirit of the Enlightenment (International Archives of the History of Ideas Archives internationales d'histoire des idées). Springer. ISBN9780792368861.
Williams, Roger L. (2002). A Guide to Rocky Mountain Plants. Lanham, MD: Roberts Rinehart. ISBN1570984123.
Williams, Roger L. (2003). French Botany in the Enlightenment: The Ill-fated Voyages of La Pérouse and His Rescuers (International Archives of the History of Ideas Archives internationales d'histoire des idées). Springer. ISBN1402011091.
Williams, Roger L. (2003). A Region of Astonishing Beauty. Lanham, MD: Roberts Rinehart. ISBN1-57098-397-6.
Williams, Roger L. (2004). "An Intellectual Biography of Elie-Abel Carrière (1818-1896)". Brittonia. 56 (4): 365–374. doi:10.1663/0007-196x(2004)056[0365:aiboec]2.0.co;2. S2CID9293528.
Williams, Roger L. (2007). "Malesherbes: Botanist, Arborist, Agronome". Journal of the Historical Society. 7 (2): 265–284. doi:10.1111/j.1540-5923.2007.00217.x.
Williams, Roger (2008). "French Connections: Cultivating American Trees in Revolutionary France"(PDF). Forest History Today (Spring): 20–27. Retrieved 2018-08-20.
Williams, Roger L. (2009). "Botanists and Medical Herbalism in Montpellier". Brittonia. 61 (1): 85–92. doi:10.1007/s12228-008-9052-x. S2CID1606490.
Williams, Roger L. (translator, editor) (2011). "On the establishment of the principal gardens of botany: a bibliographical essay by Jean-Philippe-François Deleuze"(PDF). Huntia. 14 (2): 147–176.{{cite journal}}: |first1= has generic name (help)CS1 maint: multiple names: authors list (link)
↑ Despain, Don G. (2007). "A Region of Astonishing Beauty: The Botanical Exploration of the Rocky Mountains by Roger L. Williams" . Western North American Naturalist . 67 (1): 158– 159. doi : 10.3398/1527-0904(2007)67 [ 158:aroabt ] 2.0.co ; 2 . S2CID 86918710 .