APA (7th ed.) Citation

Keintz, R. M. (1971). The demand for international travel to and from the United States. [publisher not identified].

Chicago Style (17th ed.) Citation

Keintz, Rita M. The Demand for International Travel to and from the United States. [Place of publication not identified]: [publisher not identified], 1971.

MLA (9th ed.) Citation

Keintz, Rita M. The Demand for International Travel to and from the United States. [publisher not identified], 1971.