Warren, B. (1985). Imperialism: Pioneer of capitalism ed. by John Sender. Verso Publisher.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWarren, Bill. Imperialism: Pioneer of Capitalism Ed. by John Sender. Verso Publisher, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWarren, Bill. Imperialism: Pioneer of Capitalism Ed. by John Sender. Verso Publisher, 1985.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.