1. Allen TFH, Starr TB (1988) Hierarchy: Perspectives for Ecological Complexity. The University of Chicago Press, Chicago.
2. Asia-Pacific Forestry Commission (1999) Code of practice for forest harvesting in Asia-Pacific. Food and Agriculture Organization, UN. Forest harvest Planning. Accessed on June 24, 2008 http://www.fao.org/docrep/004/AC142E/ac142e00.htm#Contents.
3. Avery TE, Burkhart HE (1994) Forest Measurements (4th edn) McGraw-Hill Inc. Boston.
4. Canadian Council of Forest Ministers (2009) Canada’s Woodland Caribou. . Accessed March 1, 2009.
5. Clements FE (1916) Plant Succession: An Analysis of the Development of Vegetation. Carnegie Institute of Washington Publication, 242. Washington DC.