Adisai Thongtawat. 1991. A studies on the efficacy of neem seed extracts and the mixture of neem seed, galanga and lemon grass in controlling the American boltworm (Heliothis armigera Hubner). Graduate School, Kasetsart University;

Adisai Thongtawat. A studies on the efficacy of neem seed extracts and the mixture of neem seed, galanga and lemon grass in controlling the American boltworm (Heliothis armigera Hubner). . Bangkok:Kasetsart University, 1991.

Adisai Thongtawat. (1991) A studies on the efficacy of neem seed extracts and the mixture of neem seed, galanga and lemon grass in controlling the American boltworm (Heliothis armigera Hubner) . Kasetsart University/Bangkok.