Widhunya Mathurasai. 1995. Development of oleoresin preparation from Thai black pepper. Graduate School, Chulalongkorn University;
Widhunya Mathurasai. (1995) Development of oleoresin preparation from Thai black pepper . Chulalongkorn University/Bangkok.
Widhunya Mathurasai. Development of oleoresin preparation from Thai black pepper. . Bangkok:Chulalongkorn University, 1995.
Widhunya Mathurasai. (1995) Development of oleoresin preparation from Thai black pepper . Chulalongkorn University/Bangkok.