(1899). [Vol. 5]: The Locomotive. George and Robert Stephenson; Lives of the Engineers. 1899.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र[Vol. 5]: The Locomotive. George and Robert Stephenson; Lives of the Engineers. 1899, 1899.
एमएलए (9वां संस्करण) प्रशस्ति पत्र[Vol. 5]: The Locomotive. George and Robert Stephenson; Lives of the Engineers. 1899, 1899.
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