McIntyre, G., Hetherington, A., & Inskeep, E. (1993). Sustainable tourism development: Guide for local planners. World Tourism Organization.
Lua i Stíl Chicago (17ú heag.)McIntyre, George, Arlene Hetherington, agus Edward Inskeep. Sustainable Tourism Development: Guide for Local Planners. Madrid, Spain: World Tourism Organization, 1993.
Lua MLA (9ú heag.)McIntyre, George, et al. Sustainable Tourism Development: Guide for Local Planners. World Tourism Organization, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.