Singh Sheelwant. Vigyan Aur Pradyogiki ka Vikas (Hindi) Civil services main Examination (5th.). Mc Grow Hill Education (India).
Cita Chicago (17th ed.)Singh Sheelwant. Vigyan Aur Pradyogiki Ka Vikas (Hindi) Civil Services Main Examination. 5th. New Delhi: Mc Grow Hill Education (India).
Cita MLA (9th ed.)Singh Sheelwant. Vigyan Aur Pradyogiki Ka Vikas (Hindi) Civil Services Main Examination. 5th. Mc Grow Hill Education (India).
Atenció: Aquestes cites poden no estar 100% correctes.