Burg, T. E., & Campbell, R. W. (2006). Milwaukee Road: Steam in the West : locomotive photos from the Roy Campbell collection. Merrill Pub. Associates.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBurg, Thomas E., और Roy W. Campbell. Milwaukee Road: Steam in the West : Locomotive Photos from the Roy Campbell Collection. Merrill, WI: Merrill Pub. Associates, 2006.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBurg, Thomas E., और Roy W. Campbell. Milwaukee Road: Steam in the West : Locomotive Photos from the Roy Campbell Collection. Merrill Pub. Associates, 2006.
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