^Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN978-1-4214-0135-5. (Pelusios williamsi, p. 286).
Bour R (1984). "Note sur Pelusios williamsi Laurent, 1965 (Chelonii, Pelomedusinae) ". Revue Française d'Aquariologie11: 27–32. (Pelusios williamsi laurenti, new subspecies). (in French).
Laurent RF (1965). "A Contribution to the Knowledge of the Genus Pelusios (Wagler)". Annales de Musée Royal de l'Afrique Centrale, Sciences Zoologiques, Tervuren, Belgium, Eighth Series (135): 1-33. (Pelusios williamsi, new species, p. 12; P. w. lutescens, new subspecies, p. 16).