Piyamart Siripokanon. 2001. Resistance of the American bollworm, Helicoverpa armigera (Hubner), to Bacillus thuringinesis. Field of Study Entomology, Kasetsart University;
Piyamart Siripokanon. (2001) Resistance of the American bollworm, Helicoverpa armigera (Hubner), to Bacillus thuringinesis . Kasetsart University/Bangkok.
Piyamart Siripokanon. Resistance of the American bollworm, Helicoverpa armigera (Hubner), to Bacillus thuringinesis. . Bangkok:Kasetsart University, 2001.
Piyamart Siripokanon. (2001) Resistance of the American bollworm, Helicoverpa armigera (Hubner), to Bacillus thuringinesis . Kasetsart University/Bangkok.