1. Abrams, E. M. (1984).Systems of Labor Organization in Late Classic Copan, Honduras: The Energetics of Construction. Unpublished Ph.D. dissertation, Pennsylvania State University, University Park, Pennsylvania.
2. Arnold, J. E. M., and Jongma, J. (1978). Fuelwood and charcoal in developing countries.Unasylva 29: 2?9.
3. World-watch Paper 60;L. R. Brown,1984
4. Bruce, D. and Schumacher, F. X. (1942).Forest Mensuration. McGraw-Hill, New York.
5. Clewell, A. F. (1972). Floristic composition of a stand of Pinus oocarpa in Honduras.Biotropica 5(3): 175?182.