Liao, Pin-Chao, Stephen R. Thomas, William J. O’Brien, Jiukun Dai, Stephen P. Mulva, and Inho Kim. “Benchmarking Project Level Engineering Productivity / Inžinerinės Veiklos našumo Lyginimas Projektų Lygmeniu”. Journal of Civil Engineering and Management 18, no. 2 (April 2, 2012): 235-244. Accessed September 28, 2021. https://journals.vgtu.lt/index.php/JCEM/article/view/4447.