Kumar, A. (2022). Challenges to Internal Security (5th ed.). McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKumar, Ashok. Challenges to Internal Security. 5th ed. Chennai: McGraw-Hill, 2022.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKumar, Ashok. Challenges to Internal Security. 5th ed. McGraw-Hill, 2022.
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