APA (7e ed.) Bronvermelding

Special Travel Industry Council on Energy Conservation. (1976). The importance of tourism to the U. S. economy: 1975 a report. United States Travel Data Center.

Chicago (17e ed.) Bronvermelding

Special Travel Industry Council on Energy Conservation. The Importance of Tourism to the U. S. Economy: 1975 a Report. Washington, D. C: United States Travel Data Center, 1976.

MLA (9e ed.) Bronvermelding

Special Travel Industry Council on Energy Conservation. The Importance of Tourism to the U. S. Economy: 1975 a Report. United States Travel Data Center, 1976.