Gurmel Singh. (1990). mannual of soil and water conseervation Practices. Oxford and IBH publishing.
Citação norma ChicagoGurmel Singh. Mannual of Soil and Water Conseervation Practices. New Delhi: Oxford and IBH publishing, 1990.
Citação norma MLAGurmel Singh. Mannual of Soil and Water Conseervation Practices. Oxford and IBH publishing, 1990.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.