A. Ikem, N. O. Egiebor and K. Nyavor, “Trace Elements in Water, Fish and Sediment from Tuskegee Lake, South-Eastern USA,” Water, Air and Soil Pollution, Vol. 149, 2003, pp. 51-75.
 R. J. Gibbs, “Transport Phases of Transition Metals in the Amazon and Yukon Rivers,” The Geological Society of America, Vol. 88, 1977, pp. 829-843.
 A. V. Filgueiras, I. Lavialla and C. Bendicho, “Chemical Sequential Extraction for Metal Partitioning in Environmental Solid Samples,” Journal of Environmental Monitoring, Vol. 4, 2002, pp. 823-857.
 P. E. Lim and M. Y. Kiu, “Determination and Speciation of Heavy Metals in Sediments of the Juru River, Penang, Malaysia,” Environmental Monitoring and Assessment, Vol. 35, 1995 pp. 85-95.
 J. A. Villaescusa-Celaya, E. A. Gutierrez-Galindo and G. Flores-Munoz, “Heavy Metals in the Fine Fraction of Coastal Sediments from Baja California (Mexico) and California (USA),” Environmental Pollution, Vol. 108, 2000, pp. 453-462.
 M. A. Badri and S. R. Aston, “Observation on Heavy Metal Geochemical Association in Polluted and Non-Polluted Estuarine Sediments,” Environmental Pollution, Series B, Vol. 6, 1983, pp. 181-183.
 J. E. Duddridge and M. Wianwright, “Heavy Metals in River Sediment-Calculation of Metals Absorption Maximum Using Langmuir and Freundhch Isotherms,” Environmental Pollution, Vol. 2, 1981, pp. 131-136.
 A. Walkley and I. A. Black, “An Examination of the Degtjareff Method for Determining Organic Carbon in Soils: Effect of Variations in Digestion Conditions and of Inorganic Soil Constituents,” Soil Science, Vol. 63, 1934, pp. 251-263.
 A. Naji, A. Ismail and A. R. Ismail, “Chemical Speciation and Contamination Assessment of Zn and Cd by Sequential Extraction in Surface Sediment of Klang River, Malaysia,” Microchemical Journal, Vol. 95, 2010, pp. 285-292. http://dx.doi.org/10.1016/j.microc.2009.12.015
 A. K. Ahmad, I. Mushrifah and M. Shuhaimi-Othman, “Water Quality and Heavy Metal Concentrations in Sediment of Sungai Kelantan, Kelantan, Malaysia: A Baseline Study,” Sains Malaysiana, Vol. 38, No. 4, 2009, pp. 435-442.
 A. Fuentes, M. Lloréns, J. Sáez, M. I. Aguilar, J. F. Ortuno and V. F. Meseguer, “Comparative Study of Six Different Sludges by Sequential Speciation of Heavy Metals,” Bioresource Technology, Vol. 99, 2008, pp. 517-525.
 C. K. Yap and S. G. Tan, “Heavy Metal Pollution in the Juru River Basin Receiving Industrial Effluents: The Need for Biochemical and Molecular Studies in the Edible Cockles Anadaragranosa. Malays,” Applied Biology, Vol. 37, No. 2, 2008, pp. 63-68.
 B. Perez-Cid, L. Lavilla and C. Bendicho, “Analytical Assessment of Two Sequential Extraction Schemes for Partitioning in Sewage Sludges,” Analyst, Vol. 121, 1996, pp. 1479-1484. http://dx.doi.org/10.1039/an9962101479
 G. P. S. Ritchie and A. M, “The Effect of pH and Metals Binding on the Transport Properties,” Journal of Soil Science, Vol. 33, 1992, pp. 233-247.
 E. Merian, “Environmental Analysis Chemistry,” Trend in Analytical Chemistry, Vol. 10, No. 8, 1991, pp. 229-231. http://dx.doi.org/10.1016/0165-9936(91)85126-C
 L. Xiangdong, S. Zhenguo, W. H. W. Onyx and L. Yok-Sheung, “Chemical Partitioning of Heavy Metal Contaminants in Sediments of the Pearl River Estuary,” Chemical Speciation and Bioavailability, Vol. 12, 2000, pp. 17-25. http://dx.doi.org/10.3184/095422900782775607
 K. Nemati, N. K. A. Bakar, M. R. Abas and E. Sobhanzadeh, “Speciation of Heavy Metals by Modified BCR Sequential Extraction Procedure in Different Depths of Sediments from Sungai Buloh, Selangor, Malaysia,” Journal of Hazardous Materials, Vol. 192, 2011, pp. 402-410.
 I. Orkun, D. G. Seckin, B. E. Cagatayhan, T. Yilmaz and B. Sari, “Heavy Metal Content and Distribution in Surface Sediments of the Seyhan River, Turkey,” Journal of Environmental Management, Vol. 92, 2011, pp. 2250-2259.