Citazione Stile APA (7a Edizione)

Butler, R. W., & Boyd, S. W. (2000). Tourism and national parks: Issues and implications. Wiley.

Citazione stile Chigago Style (17a edizione)

Butler, Richard W., e Stephen W. Boyd. Tourism and National Parks: Issues and Implications. Chichester: Wiley, 2000.

Citatione MLA (9a ed.)

Butler, Richard W., e Stephen W. Boyd. Tourism and National Parks: Issues and Implications. Wiley, 2000.