1. Edmondson, W T and Winberg, G G. 1971.A Manual on Methods for the Assessment of Secondary Productivity in Fresh Waters., 1–358. Oxford: Blackwell.
2. Gayanilo, F C, Sparre, P and Pauly, D. 1995.The FAO‐ICLARM Stock Assessment Tools (FISAT) User's Guide, Fao Computerized Information Series (Fisheries) No 7 1–126. Rome