Não informado. (1957). American road builder. American Road Builders Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. American Road Builder. Washington: American Road Builders Association, 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. American Road Builder. American Road Builders Association, 1957.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.