1795. The Historia Testudinum iconibus illustrata. Fasc. 5. Erlangen, Plag. L-O (32 pp.), 6 pls.
Schwartz, A.
1956. The relationships and nomenclature of the soft-shelled turtles (genus Trionyx) of the southeastern United States. Charleston Mus. Leaflet, 26:1-21, 1 fig., 2 maps, 3 pls., May.
* Schweigger, A. F.
1812. Monographiae cheloniorum. Königsberger Arch. Naturwiss. Math., 1:271-368, 406-458 (from Loveridge and Williams, 1957:533).
Shields, L. M., and Lindeborg, R. G.
1956. Records of the spineless soft-shelled turtle and the snapping turtle from New Mexico. Copeia, 1956(2):120-21, May 29.
Shockley, C. H.
1949. Fish and invertebrate populations of an Indiana bass stream. Invest. Indiana Lakes Streams, 3(5):247-70, 4 figs., 4 tables.
Shoup, C. S., Peyton, J. H., and Gentry, G.