Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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