West, G., & Ewan, V. J. (1981). Site investigation and construction of the Dinorwic diversion tunnel. Transport and Road Research Laboratory.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWest, G., और V. J. Ewan. Site Investigation and Construction of the Dinorwic Diversion Tunnel. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWest, G., और V. J. Ewan. Site Investigation and Construction of the Dinorwic Diversion Tunnel. Transport and Road Research Laboratory, 1981.
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