APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Symposium on Technology and Economics, & Landau, R. (1991). Technology & economics: Papers commemorating Ralph Landau's service to the National Academy of Engineering. National Academy Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Symposium on Technology and Economics, और Ralph Landau. Technology & Economics: Papers Commemorating Ralph Landau's Service to the National Academy of Engineering. Washington, D.C.: National Academy Press, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, et al. Technology & Economics: Papers Commemorating Ralph Landau's Service to the National Academy of Engineering. National Academy Press, 1991.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.