Thorson, T.B. & Watson, D.E. & Cowan, C.M. (1976)
The status of the Lake Nicaragua shark: an updated appraisal. In Investigation of the ichthyofauna of Nicaraguan lakes, edited by T.B. Thorson. Lincoln, Nebraska, University of Nebraska Press: 561–574

Watson, D.E. & Thorson, T.B. (1976)
Helminths from elasmobranchs in Central American fresh waters. In Investigation of the ichthyofauna of Nicaraguan lakes, edited by T.B. Thorson. Lincoln, Nebraska, University of Nebraska Press 629–640

Thorson, T.B. & Cowan, C.M. & Watson, D.E. (1976)
Body Fluid Solutes of Juveniles and Adults of the Euryhaline Bull Shark Carcharhinus leucas from Freshwater and Saline Environments. In Investigation of the ichthyofauna of Nicaraguan lakes, edited by T.B. Thorson. Lincoln, Nebraska, University of Nebraska Press: 599–612

Thorson, T.B. & Watson, D.E. & Cowan, C.M. (1976)
The Status of the Freshwater Shark of Lake Nicaragua. In Investigation of the ichthyofauna of Nicaraguan lakes, edited by T.B. Thorson. Lincoln, Nebraska, University of Nebraska Press: 385–402

Thorson, T.B. & Watson, D.E. (1975)
Reassignment of the African freshwater stingray, Potamotrygon garouaensis, to the genus Dasyatis, on physiologic and morphologic grounds. Copeia, 1975(4), 701–712

Thorson, T.B. & Cowan, C.M. & Watson, D.E. (1973)
Body fluid solutes of juveniles and adults of the euryhaline bull shark Carcharhinus leucas from freshwater and saline environments. Physiological Zoology, 46(1), 29–42

Thorson, T.B. & Cowan, C.M. & Watson, D.E. (1967)
Potamotrygon spp.: elasmobranchs with low urea content. Science, 158, 375–377

Thorson, T.B. & Watson, D.E. & Cowan, C.M. (1966)
The status of the freshwater shark of Lake Nicaragua. Copeia, 1966(3), 385–402

Thorson, T.B. & Cowan, C.M. & Watson, D.E. (1966)
Sharks and sawfish in the Lake Izabal-Rio Dulce system, Guatemala. Copeia, 1966(3), 620–622