1. ASTM D388. Standard Classification of Coals by Rank. Annual Book of Standards. American Society for Testing and Materials. West Conshohocken, Pennsylvania.
2. ASTM D3175. Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke. Annual Book of Standards. American Society for Testing and Materials. West Conshohocken, Pennsylvania.
3. Cohen , A.D. 1970. “An Allochthonous Peat Deposit from Southern Florida.”, Bulletin of the Geological Society of America , 81: 2477-2482.
4. DOE/EIA 1995. Coal Data: A Reference. Report No. DOE/EIA-0064(93). Energy Information Administration, United States Department of Energy, Washington, DC.