Wang, Zhiling, Thomas de Graaff, and Peter Nijkamp. “Barriers of Culture, Networks, and Language in International Migration: A Review”. REGION 5, no. 1 (May 11, 2018): 73-89. Accessed August 6, 2020. https://openjournals.wu.ac.at/ojs/index.php/region/article/view/203.