"Kunitz, J. (1973). Karl Marx and Fredrich Engels: An introduction to their lives and work. Monthly review.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"Kunitz, Joshus. Karl Marx and Fredrich Engels: An Introduction to Their Lives and Work. Monthly review, 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"Kunitz, Joshus. Karl Marx and Fredrich Engels: An Introduction to Their Lives and Work. Monthly review, 1973.
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