Prapas Khorphueng. 1995. Modification and purification of rosin. Bangkok:Chulalongkorn University;
Prapas Khorphueng. (1995) Modification and purification of rosin (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.
Prapas Khorphueng. Modification and purification of rosin. Bangkok:Chulalongkorn University, 1995.
Prapas Khorphueng. (1995) Modification and purification of rosin (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.