1. Stankey GH, Cole DN, Lucas RC, Petersen ME, Frissell SS. The Limits of Acceptable Change (LAC) System for Wilderness Planning, General Technical Report INT-176. United States Department of Agriculture, Forest Service; 1985.
2. VERP: Visitor Experience and Resource Protection framework,1997
3. Developing a Tourism Optimisation Management Model (TOMM), a model to monitor and manage tourism on Kangaroo Island, South Australia,1997
4. Visitor impact management: The planning framework;AR Graefe,1990
5. Parks Canada. Management process for visitor activities. National Parks Directorate, Visitor Activities Branch; 1985.