Middleton, V. T. C., & Hawkins, R. (1998). Sustainable Tourism: A Marketing Perspective (1ed. st.). Butterworth-Heinemann.
Lua i Stíl Chicago (17ú heag.)Middleton, Victor T. C., agus Rebecca Hawkins. Sustainable Tourism: A Marketing Perspective. 1ed. st. Oxford: Butterworth-Heinemann, 1998.
Lua MLA (9ú heag.)Middleton, Victor T. C., agus Rebecca Hawkins. Sustainable Tourism: A Marketing Perspective. 1ed. st. Butterworth-Heinemann, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.