Gulf of Mexico, southeastern United States and the Bahamas, eastern Pacific Ocean
Courtney, C. H., and D. J. Forrester. 1974. Helminth parasites of the brown pelican in Florida and Louisiana. Proceedings of the Helminthological Society of Washington 41: 89–93.
Dronen, N. O., C. K. Blend, and C. K. Anderson. 2003. Endohelminths from the brown pelican, Pelecanus occidentalis, and the American white pelican, Pelecanus erythrorhynchos, from Galveston Bay, Texas, U.S.A., and checklist of pelican parasites. Comparative Parasitology 70: 140–154.
Forrester, D. J., and M. G. Spalding. 2003. Parasites and Disease of Wild Birds in Florida. University Press of Florida, Gainesville, Florida. 1133 pp.
Kinsella, J. M., M. G. Spalding, and D. J. Forrester. 2004. Parasitic helminths of the American white pelican, Pelecanus erythrorhynchos, from Florida, U.S.A. Comparative Parasitology 71: 29–36.
Added keyword "parasitic"
Overstreet, R. M., J. O. Cook, and R. W. Heard. 2009. Trematoda (Platyhelminthes) of the Gulf of Mexico, Pp. 419–486 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas.
Harte Research Institute for Gulf of Mexico Studies. 2016. GulfBase: Resource Database for Gulf of Mexico Research, Education, and Management. Texas A&M University-Corpus Christi. World Wide Web electronic publication. http://www.gulfbase.org, 09-30-2020.