O' Hagan, J. W., & John, A. A. (1981). The economic significance of tourism within the European community: A fourth report by the working group of the National Tourist Organization of the EEC. BTA.
Chicagoスタイル(17版)引用形式O' Hagan, John William, , A. A. John. The Economic Significance of Tourism Within the European Community: A Fourth Report by the Working Group of the National Tourist Organization of the EEC. London: BTA, 1981.
MLA(9版)引用形式O' Hagan, John William, , A. A. John. The Economic Significance of Tourism Within the European Community: A Fourth Report by the Working Group of the National Tourist Organization of the EEC. BTA, 1981.
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