1. Faculty of Engineering Universiti Malaysia Sabah Kota Kinabalu Sabah Malaysia
2. School of Civil Engineering, Engineering Campus Universiti Sains Malaysia Penang Malaysia
3. Solid Waste Management Cluster, Science and Technology Research Centre, Engineering Campus Universiti Sains Malaysia Penang Malaysia
4. School of Technology Management and Logistics, College of Business Universiti Utara Malaysia Sintok Kedah Malaysia