Gurmel Singh. (1990). mannual of soil and water conseervation Practices. Oxford and IBH publishing.
シカゴスタイル引用形Gurmel Singh. Mannual of Soil and Water Conseervation Practices. New Delhi: Oxford and IBH publishing, 1990.
MLA引用形式Gurmel Singh. Mannual of Soil and Water Conseervation Practices. Oxford and IBH publishing, 1990.
警告: この引用は必ずしも正確ではありません.