1. Curbing excess sprawl with congestion tolls and urban boundaries;Anas;Reg. Sci. Urban Econ.,2006
2. The Dynamics of Global Urban Expansion;Angel,2005
3. Planet of Cities;Angel,2012
4. Baltimore County Master Plan 2020. http://resources.baltimorecountymd.gov/Documents/Planning/masterplan/masterplan2020.pdf. (Accessed 7 December 2017).
5. Fractal Cities: A Geometry of Form and Function;Batty,1994