Sangkhae Nawanich. 1999. Some insecticidal plant extracts for controlling maize weevil Sitophilus Zeamais motschulsky (Coleoptera : Curculionidae). Graduate School, Kasetsart University;
Sangkhae Nawanich. (1999) Some insecticidal plant extracts for controlling maize weevil Sitophilus Zeamais motschulsky (Coleoptera : Curculionidae) . Kasetsart University/Bangkok.
Sangkhae Nawanich. Some insecticidal plant extracts for controlling maize weevil Sitophilus Zeamais motschulsky (Coleoptera : Curculionidae). . Bangkok:Kasetsart University, 1999.
Sangkhae Nawanich. (1999) Some insecticidal plant extracts for controlling maize weevil Sitophilus Zeamais motschulsky (Coleoptera : Curculionidae) . Kasetsart University/Bangkok.