1. Faculty of Chemical Engineering, Universiti Teknologi MARA, Sarawak Campus, 94300 Kota Samarahan, Sarawak, Malaysia
2. Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Sarawak, Malaysia
3. Faculty of Applied Sciences, Universiti Teknologi MARA, Sarawak Campus, 94300 Kota Samarahan, Sarawak, Malaysia