"Glossary of environmental and waste management terms". Handbook of Solid Waste Management and Waste Minimization Technologies. Butterworth-Heinemann. 2003. pp. 337–465. doi:10.1016/B978-075067507-9/50010-3. ISBN9780750675079.
Elegba, S. B. (2006). "Import/export control of radioactive sources in Nigeria". Safety and security of radioactive sources: Towards a global system for the continuous control of sources throughout their life cycle. Proceedings of an international conference. Archived from the original on 20 September 2021. Retrieved 27 February 2021.
Elegba, S. B. (2006). "Import/export control of radioactive sources in Nigeria". Safety and security of radioactive sources: Towards a global system for the continuous control of sources throughout their life cycle. Proceedings of an international conference. Archived from the original on 20 September 2021. Retrieved 27 February 2021.