Παραπομπή APA

Butler, R. W. e., & Russell, R. A. e. b. (2010). Giants of tourism. CABI.

Παραπομπή Chicago Style

Butler, Richard W; ed, και Roslyn A; ed. by Russell. Giants of Tourism. Oxford: CABI, 2010.

Παραπομπή MLA

Butler, Richard W; ed, και Roslyn A; ed. by Russell. Giants of Tourism. CABI, 2010.