British Travel Educational Trust. (1978). A comparative study of the provision of tourist information services in Western Europe annd North America. British Travel Educational Trust.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBritish Travel Educational Trust. A Comparative Study of the Provision of Tourist Information Services in Western Europe Annd North America. London: British Travel Educational Trust, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBritish Travel Educational Trust. A Comparative Study of the Provision of Tourist Information Services in Western Europe Annd North America. British Travel Educational Trust, 1978.
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