Baldwin, R. E., Forslid, R., Martin, P., Ottaviano, G. I. P., & Robert-Nicoud, F. (2003). Economic geography and public policy. Princeton, New Jersey: Princeton University Press.

Baldwin, Richard E., Rikard Forslid, Philippe Martin, Gianmarco I. P. Ottaviano, and Frédéric Robert-Nicoud. Economic Geography and Public Policy. Princeton, New Jersey: Princeton University Press, 2003.

Baldwin, Richard E., et al. Economic Geography and Public Policy. Princeton, New Jersey: Princeton University Press, 2003.