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Abdulkadir Abu Lawal,  The Appraisal of Construction Sites Productivity: In Kendall’s Concordance.   journal   = {International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2017, vol. 121(1). 1 - 5[viewed 23 June 2018]. Available from: http://waset.org/publications/10005999.