1. AHLSTROM, E.M., 1937. Plankton Rotatoria from Northeast Brazil. Ann. Acad. Brasileira de Ciencias, 1: 30–45.
2. ASTORQUI, I., 1974. Peces de la Cuenca de los Grandes Lagos de Nicaragua. Publicationes Nicaraguenses S.A., Managua, Nicaragua.
3. BOUGHEY, A.S., 1973. Ecology of populations. MacMillan Publishing Co., Inc., New York.
4. BRANDORFF, G.O., W. KOSTE and N.N. SMIRNOV, 1982. The composition and structure of Rotiferan and Crustacean Communities of the Lower Rio Nhamunda, Amazonas, Brasil. Studies on Neotropical Fauna and Environment, 17: 69–121.
5. BRINSON, M. and F.G. NORDLIE, 1975. Lake Izabal, Guatemala. II. Lakes. 8. Central and South America. Verh. Internat. Verein. Limnol., 19: 1468–1479.