Li, Z., S. R. S. Dawood, and X. Zhang. “An Appraisal of Asia-Pacific Cities As Control and Command Centres Embedded in World City Network”. Engineering, Technology & Applied Science Research 7, no. 4 (August 9, 2017): 1879–1882. Accessed September 19, 2021. https://etasr.com/index.php/ETASR/article/view/1139.