JOHNSON, R. (1995). Ralph Johnson of perkins and will building and projects. Rizzoli.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJOHNSON, Ralph. Ralph Johnson of Perkins and Will Building and Projects. New York: Rizzoli, 1995.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJOHNSON, Ralph. Ralph Johnson of Perkins and Will Building and Projects. Rizzoli, 1995.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.