1. Adamczewska M, Siepak J, Gramowska H (2000) Studies of levels of polycyclic aromatic hydrocarbons in soils subjected to anthropopressure in the city of Poznan. Polish J Environ Stud 9(4):305
2. ASTM (2000) Standard test methods for moisture, ash, and organic matter of peat and other organic soils. Method D 2974-00. American Society for Testing and Materials. West Conshohocken, PA
3. Benner BAJ, Bryner NP, Wise SA et al (1990) Polycyclic aromatic hydrocarbons emissions from the combustion of crude oil on water. Environ Sci Technol 24:1418–1427
4. Bjorseth A, Ramdahl T (1985) Sources of emissions of PAH. In: Bjorseth A, Ramdahl T (eds) Handbook of polycyclic aromatic hydrocarbons, vol 2. Marcel Dekker, New York, pp 1–20
5. Cassava (2015)Cassava. Encyclopædia Britannica online. http://www.britannica.com/EBchecked/topic/98103/cassava . Accessed on 13 Feb 2015