Watkins, F. M. (1965). Age of Ideology: Political thought 1750 to the Present. Prentice Hall of India.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWatkins, Frederick M. Age of Ideology: Political Thought 1750 to the Present. Prentice Hall of India, 1965.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWatkins, Frederick M. Age of Ideology: Political Thought 1750 to the Present. Prentice Hall of India, 1965.
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