Varaporn Cholumpai. 1998. Utilization of chitosan for chelation of lead in waste water. Bangkok:Mahidol University;
Varaporn Cholumpai. (1998) Utilization of chitosan for chelation of lead in waste water (รายงานผลงานวิจัย). Mahidol University:Bangkok.
Varaporn Cholumpai. Utilization of chitosan for chelation of lead in waste water. Bangkok:Mahidol University, 1998.
Varaporn Cholumpai. (1998) Utilization of chitosan for chelation of lead in waste water (รายงานผลงานวิจัย). Mahidol University:Bangkok.