Hadlow, R. W. (2001). Elegant arches, soaring spans: C.B. McCullough, Oregon's master bridge builder. Oregon State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHadlow, Robert W. Elegant Arches, Soaring Spans: C.B. McCullough, Oregon's Master Bridge Builder. Corvallis: Oregon State University Press, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHadlow, Robert W. Elegant Arches, Soaring Spans: C.B. McCullough, Oregon's Master Bridge Builder. Oregon State University Press, 2001.
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