APA استشهاد

Gurmel Singh. (1990). mannual of soil and water conseervation Practices. Oxford and IBH publishing.

استشهاد بنمط شيكاغو

Gurmel Singh. Mannual of Soil and Water Conseervation Practices. New Delhi: Oxford and IBH publishing, 1990.

MLA استشهاد

Gurmel Singh. Mannual of Soil and Water Conseervation Practices. Oxford and IBH publishing, 1990.