APA (7th ed.) Citation

Cleverdon, R., & Edwards, A. D. (1982). International tourism to 1990. Abt Books.

Chicago Style (17th ed.) Citation

Cleverdon, Robert, and Anthony David Edwards. International Tourism to 1990. Cambridge, Mass: Abt Books, 1982.

MLA (9th ed.) Citation

Cleverdon, Robert, and Anthony David Edwards. International Tourism to 1990. Abt Books, 1982.