Hay Associates. (1978). United kingdom: A study of the international travel market. United States Department of Commerce, United States Travel Service.Research & Analysis Division.
Chicagoスタイル(17版)引用形式Hay Associates. United Kingdom: A Study of the International Travel Market. [S.l.]: United States Department of Commerce, United States Travel Service.Research & Analysis Division, 1978.
MLA(9版)引用形式Hay Associates. United Kingdom: A Study of the International Travel Market. United States Department of Commerce, United States Travel Service.Research & Analysis Division, 1978.
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