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Yeh, A. G., Yang, F. F., & Wang, J. (2014). Producer service linkages and city connectivity in the mega-city region of China: A case study of the Pearl River Delta. Urban Studies
http://usj.sagepub.com/content/early/2014/08/07/0042098014544762.abstract
Schwartz, A. (1993). Subservient suburbia: The reliance of large suburban companies on central city firms for financial and professional services. Journal of the American Planning Association, 59(3), 288-305.
http://www.tandfonline.com/doi/abs/10.1080/01944369308975881#.VIF3JoXPPjw