APA
UNITED NATIONS E. A. S. A. (. o., UNITED NATIONS E. A. S. A. (. o., . (1978). Provisional guidelines on statistics of international tourism. New York: United Nations.
Chicago
UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), . 1978. Provisional guidelines on statistics of international tourism. New York: United Nations.
Harvard
UNITED NATIONS E. A. S. A. (. o., UNITED NATIONS E. A. S. A. (. o., . (1978). Provisional guidelines on statistics of international tourism. New York: United Nations.
MLA
UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), . Provisional guidelines on statistics of international tourism. New York: United Nations. 1978.
