Zeb, A., A. Qudoos, and H. Hanif. “Identification and Analysis of Factors Affecting Machinery in the Construction Industry of Pakistan”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 19, no. 1, Jan. 2015, pp. 269-78, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3217.