Oladipo, O., and F. Olukayode. “An Assessment of the Relationship Between Macro-Economic Indicators and Prices of Building Materials in Nigerian Construction Industry”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 6, Nov. 2015, pp. 112-23, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4852.