Abrahamson, Mark (2004). Global cities(PDF) (1st ed.). New York: Oxford University Press. p. 4. ISBN978-0195142044. Archived(PDF) from the original on 11 January 2021. Retrieved 9 January 2021.
"Struggling Giants". University of Minnesota Press. Archived from the original on 17 January 2021. Retrieved 31 December 2020.
Abrahamson, Mark (2004). Global cities(PDF) (1st ed.). New York: Oxford University Press. p. 4. ISBN978-0195142044. Archived(PDF) from the original on 11 January 2021. Retrieved 9 January 2021.