Chan, Wanyu R.; Chan, Wanyu R.; Nazaroff, William W.; Price, Phillip N. & Gadgil, Ashok J. Effectiveness of Urban Shelter-in-Place. III: Commercial Districts, article, December 28, 2007; (https://digital.library.unt.edu/ark:/67531/metadc901807/m1/1/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .