Exman, E. (1967). The house of Harper: One hundred and fifty years of publishing. Harper & Row.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रExman, Eugene. The House of Harper: One Hundred and Fifty Years of Publishing. New York [u.a.]: Harper & Row, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रExman, Eugene. The House of Harper: One Hundred and Fifty Years of Publishing. Harper & Row, 1967.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.