Nyassa

Hall, J.; Whitfield, R. P. (1869-1870). Preliminary notice of the lamellibranchiate shells of the upper Helderberg, Hamilton and Chemung groups, with others from the Waverly sandstones. Part 2. New York State Museum, Albany, 90 pp. [p. 1-80 (1869), p. 81-97 (1870)].

Pojeta, J. Jr.; Zhang, R.-J.; Yang, Z.-Y. (1986). Systematic paleontology of Devonian pelecypods of Guangxi and Michigan. In: Pojeta, J. Jr. Devonian Rocks and Lower and Middle Devonian Pelecypods of Guangxi, China, and the Traverse Group of Michigan. <em>United States Geological Survey Professional Paper.</em> 1394-G: 57-102.