1. http://www.globalproblems-globalsolutions-files.org/gpgs_files/pdf/UNF_Bioenergy/UNF_Bioenergy_5.pdf.
2. Biobased Industrial Products: Research and Commercialization Priorities;Committee on Biobased Industrial Products,2000
3. http://www.motherearthnews.com/homesteading-and-livestock/home-business-selling-firewood-zmaz76soztak.
4. https://www.recipeshubs.com/food?t=cherry-logs.
5. http://caldwelltreecare.com/contact-us/free-tree-mulch/, https://www.ruralking.com/hardwood-wood-pellet-fuel-40lb.html.