1. Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim, Perak, Malaysia
2. Department of Chemistry, Bharath Institute of Higher Education and Research, Chennai, Tamil Nadu, India
3. Waste and Environment Technology Division, Malaysian Nuclear Agency, Kajang, Selangor, Malaysia
4. Department of English Language and Literature, Faculty of Languages and Communication, Universiti Pendidikan Sultan Idris, Tanjong Malim, Perak, Malaysia