Singh, S. S. Crop management (BP-89/91.). Kalyani Publishers.
Lua i Stíl Chicago (17ú heag.)Singh, S. S. Crop Management. BP-89/91. New Delhi: Kalyani Publishers.
Lua MLA (9ú heag.)Singh, S. S. Crop Management. BP-89/91. Kalyani Publishers.
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