(2005-09-10) “Water Resources of India”, Current Science89 (5), p. 794–811. Alirita 2013-10-13..
fao.org
R. Ziesler and G.D. Ardizzone: The Inland Waters of Latin America. COPESCAL Technical Paper No. 1, FAO, Fishery Information, Data and Statistics Service, Rome 1979 [2]