“Investigation of the Use of Energy Efficient Bulbs in Residential Buildings in Ile-Ife, Osun State, NigeriaInvestigation of the Use of Energy Efficient Bulbs in Residential Buildings in Ile-Ife, Osun State, Nigeria” (2018) International Journal of Built Environment and Sustainability, 5(2). doi:10.11113/ijbes.v5.n2.269.