FAO (2010) Global Forest Resources Assessment, Food and Agriculture Organization of the United Nations, Pakistan. Working Paper 144/E, Rome, Italy.
 Corona, P., Fattorini, L. and Franceschi, S. (2009) Estimating the Volume of Forest Growing Stock Using Auxiliary Information Derived from Relascope or Ocular Assessments. Forest Ecology and Management, 257, 2108-2114.
 Addo-Fordjour, P., Obeng, S., Anning, A.K. and Addo, M.G. (2009) Floristic Composition, Structure and Natural Regeneration in a Moist Semi-Deciduous Forest Following Anthropogenic Disturbances and Plant Invasion. Int. J. of Biodiversity and Cons., 1, 21-37.
 Gebrihiwot, M. (2003) Assessment of Natural Regeneration Diversity and Distribution of Forests Tree Species. A Case Study on Wondo-Wesha Catchment Awassa Watershed Southern Ethiopia. International Institute for Geo, Information Science and Earth Observation, Enscheda, Netherlands, 10-23.
 Hu, Y.Y., Kang, X.G. and Zhao, J.H. (2009) Variable Relationship between Tree Age and Diameter at Breast Height for Natural Forests in Changbai Mountains. Journal of Northeast Forestry, 37, 38-42.
 Al-Amin, M., Alamgir, M. and Bhuiyan, M.A.R. (2005) Structural Composition Based on Diameter and height Class Distribution of a Deforested Area of Chittagong, Bangladesh. Journal of Applied Sciences, 5, 227-231.
 Pandey, S. and Bajracharya, S.B. (2010) Vegetation Composition and Biomass Production in Community Forest in Sikre VDC Adjoining Shivapuri National Park, Kathmandu. Nepal Journal of Science and Technology, 11, 133-138.