1. Rotação das culturas e sistemas de produção;Alcover,1976
2. Consumptive Use of Water and Irrigation Water Requirements;American Society of Civil Engineers,1973
3. Chuvas no Brasil-Regime, variabilidade e probabilidades de alturas mensais e anuais;Azevedo,1974
4. Gamma distribution parameters for 2 and 3 week precipitation totals;Barger,1959
5. Problems and Methods in Agricultural Climatology;Jen-hu,1971