On the pelvis and external sexual organs of selachians, with special reference to the new genera Potamotrygon and Disceus. Proceedings of the Boston Society of Natural History, 19, 197–215
Checklist of living Chondrichthyes. In W.C. Hamlett (Ed.), Reproductive biology and phylogeny of chondrichthyes: sharks, rays and chimaeras, Vol. 3 (pp. 503–548). Science Publishers, Endfield, USA
A survey of tail spine characteristics of stingrays frequenting western Atlantic Ocean and South American freshwater rivers. Journal of the North Carolina Academy of Science, 125(2), 47–60
Ways to identify stingrays of the world possessing or lacking serrated stinging tail spines. Journal of the North Carolina Academy of Science, 125(3), 107–109
Biology of the South American Potamotrygonid Stingrays. In Carrier, J.C. & Musick, J.A. & Heithaus, M.R. (Eds) Sharks and Their Relatives II: Biodiversity, Adaptive Physiology, and Conservation. CRC Press, Boca Raton: 241–282
IX. Rayas de agua dulce (Potamotrygonidae) de Suramérica. Parte I. Colombia, Venezuela, Ecuador, Perú, Brasil, Guyana, Surinam y Guayana Francesa: diversidad, bioecología, uso y conservación. Serie Editorial Recursos Hidrobiológicos y Pesqueros Continentales de Colombia. Instituto de Investigación de los Recursos Biológicos Alexander von Humboldt(IAvH). Bogotá, D. C., Colombia. 368 pp.
Systematics and morphology of Potamotrygon orbignyi (Castelnau, 1855) and allied forms (Chondrichthyes: Myliobatiformes: Potamotrygonidae). Zootaxa, 3982(1), 1–82
Uso de Recursos e Dieta das Raias de Água Doce (Chondrichthyes, Potamotrygonidae) da Reserva Biológica do Parazinho, AP (Resource use and diet of freshwater stingrays (Chondrichthyes: Potamotrygonidae) of the Biological Reserve Parazinho, AP). Biota Amazônia, 5(1), 90–98
DOI: 10.18561/2179-5746/biotaamazonia.v5n1p90-98
The first two species of South American freshwater stingrays of the genus Potamotrygon, reported from the Orinoco Basin of Colombia by François Roulin in 1829. Aqua, International Journal of Ichthyology, 26(3–4), 92–112