Singh Sheelwant. Vigyan Aur Pradyogiki ka Vikas (Hindi) Civil services main Examination (5th.). Mc Grow Hill Education (India).
Chicago-viite (17. p.)Singh Sheelwant. Vigyan Aur Pradyogiki Ka Vikas (Hindi) Civil Services Main Examination. 5th. New Delhi: Mc Grow Hill Education (India).
MLA-viite (9. p.)Singh Sheelwant. Vigyan Aur Pradyogiki Ka Vikas (Hindi) Civil Services Main Examination. 5th. Mc Grow Hill Education (India).
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