APA (7th ed.) Citation

United States Travel Data Center. (1973). Travel data locator index: A reference guide to current data on travel and recreation. United States Travel Data Center.

Chicago Style (17th ed.) Citation

United States Travel Data Center. Travel Data Locator Index: A Reference Guide to Current Data on Travel and Recreation. Washington, D. C: United States Travel Data Center, 1973.

MLA (9th ed.) Citation

United States Travel Data Center. Travel Data Locator Index: A Reference Guide to Current Data on Travel and Recreation. United States Travel Data Center, 1973.