Helfman, Collette & Facey 1997, pp.  463 "Threatened and Endangered Species: Pallid Sturgeon Scaphirhynchus Fact Sheet".
2006년 1월 18일에 확인함.  Helfman, Collette & Facey 1997, 463쪽 “Threatened and Endangered Species: Pallid Sturgeon Scaphirhynchus Fact Sheet”.