APA (7 वां संस्करण) प्रशस्ति पत्र

Singh Sheelwant. Vigyan Aur Pradyogiki ka Vikas (Hindi) Civil services main Examination (5th.). Mc Grow Hill Education (India).

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Singh Sheelwant. Vigyan Aur Pradyogiki Ka Vikas (Hindi) Civil Services Main Examination. 5th. New Delhi: Mc Grow Hill Education (India).

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Singh Sheelwant. Vigyan Aur Pradyogiki Ka Vikas (Hindi) Civil Services Main Examination. 5th. Mc Grow Hill Education (India).