Sumalai Srikumlaithong. 1994. Preparation of high quality activated carbon from lignite. Bangkok:Thailand Institute of Scientific and Technological Research;
Sumalai Srikumlaithong. (1994) Preparation of high quality activated carbon from lignite (รายงานผลงานวิจัย). Thailand Institute of Scientific and Technological Research:Bangkok.
Sumalai Srikumlaithong. Preparation of high quality activated carbon from lignite. Bangkok:Thailand Institute of Scientific and Technological Research, 1994.
Sumalai Srikumlaithong. (1994) Preparation of high quality activated carbon from lignite (รายงานผลงานวิจัย). Thailand Institute of Scientific and Technological Research:Bangkok.