1. Recreational opportunities for public use in Ayer Hitam Forest: setting the stage and park management approach;Abdullah;Pertanika Journal of Tropical Agriculture Science,1999
2. Abidin, Z.Z. (1999). The identification of criteria and indicators for the sustainable management of ecotourism in Taman Negara National Park, Malaysia: a delphi consensus. Unpublished PhD Dissertation, West Virginia University, West Virginia.
3. Constructing Co-generative Search Processes: Re-thinking Urban Planning/Making Urban Plans Actionable [Article];Ataöv;European Planning Studies,2008
4. Ceballos-Lascurain, H. (1996). Tourism, ecotourism and protected areas: the state of nature-based tourism. Retrieved 6 April 2011, from http://books.google.com.my/books?id=8WGBtSYsNIwC&printsec=frontcover&source=gbs_ge_summary_ r&cad=0#v=onepage&q&f=false.
5. The role of urban parks for the sustainable city;Chiesura;Landscape and Urban Planning,2004