Sheel S.K. (2015). Textbook of Basic Mathematics: For Forestry, Horticulture and Agriculture Courses. Daya Publishing House.
Lua i Stíl Chicago (17ú heag.)Sheel S.K. Textbook of Basic Mathematics: For Forestry, Horticulture and Agriculture Courses. New Delhi: Daya Publishing House, 2015.
Lua MLA (9ú heag.)Sheel S.K. Textbook of Basic Mathematics: For Forestry, Horticulture and Agriculture Courses. Daya Publishing House, 2015.
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