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Travel trends in the United States and Canada
Goeldner, Charles R., (1978)
The Measurement of tourism : 1. Tourism forecasting. 2. Tourism and the balance of payments ; a guide based on a seminar held at Haslemere, England, September, 1974
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1977 Minnesota's tourist-travel industry
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Planning for tourism : research needs in a growth industry
Shackleford, Peter, (1979)
Special issue: Measurement of the economic impact of tourism : WTO's Enzo Paci World Conference at Nice, [France, 15 -18 June 1999]
Shackleford, Peter, (1999)
A history of the World Tourism Organization
Shackleford, Peter, (2020)