(1981). Civilization Past & Present Vol. 2 T. Walter Wallbank...[et.al.]. Scott, Foresman and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCivilization Past & Present Vol. 2 T. Walter Wallbank...[et.al.]. Scott, Foresman and Company, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCivilization Past & Present Vol. 2 T. Walter Wallbank...[et.al.]. Scott, Foresman and Company, 1981.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.