His Floristic study of Morne la Visite and Pic Macaya ... 1987: t.p. (Walter S. Judd) p. 1 (assoc. prof. of botany, Univ. of Florida, Gainesville)

Plant systematics, 1999: CIP t.p. (Walter S. Judd) data sheet (b. 1951)

OCLC, viewed March 4, 2022 (access points: Judd, Walter Stephen; Judd, Walter S.; Judd, W. S.; usage: Walter S. Judd; Walter Stephen Judd)

University of Florida (website), viewed March 4, 2022: Walter Judd (Distinguished Professor, Emeritus. Ph.D., Harvard University, 1978.) https://biology.ufl.edu/lyonia/

Walter S. Judd's CV, viewed March 4, 2022 (Walter S. Judd. Education: B.S. with high honor, Michigan State University, 1973. M.S., Michigan State University, 1974 -- thesis: The systematics of Lyonia (Ericaceae) in North America. Ph.D., Harvard University, 1978 -- dissertation: A monograph of Lyonia (Ericaceae). Professional Positions: Assistant Professor, Department of Botany, University of Florida, 1978-1983; Associate Professor, 1983-1991; Full Professor, 1991-2009; Distinguished Professor, 2009-2013; Distinguished Professor Emeritus, 2013-present. Affiliate Assistant Curator in Botany, Florida State Museum, University of Florida, 1979; Affiliate Associate Curator in Botany, 1983-1991; Affiliate Curator in Botany, 1991-present. Affiliate Professor, Tropical Conservation and Development, 1993-2013. Affiliate Professor, Interdisciplinary Ecology, 1999-2013 Acting Curator, Vascular Plant Herbarium, University of Florida, 1979-1981. Fairchild Research Associate; Fairchild Tropical Garden, 1999-present.) https://biology.ufl.edu/files/vitae-WJudd.pdf