Cita APA (7th ed.)

Costa, D. L., & Kahn, M. E. (2001). Understanding the decline in social capital, 1952-1998. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Costa, Dora L., i Matthew E. Kahn. Understanding the Decline in Social Capital, 1952-1998. Cambridge: National Bureau of Economic Research, 2001.

Cita MLA (9th ed.)

Costa, Dora L., i Matthew E. Kahn. Understanding the Decline in Social Capital, 1952-1998. National Bureau of Economic Research, 2001.