Singh, G. .. (1979). Transformation of agriculture. Vishal Pub.
Lua i Stíl Chicago (17ú heag.)Singh, G .B. Transformation of Agriculture. Haryana: Vishal Pub, 1979.
Lua MLA (9ú heag.)Singh, G .B. Transformation of Agriculture. Vishal Pub, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.