"This paper starts with a discussion of definitions of social capital, then turns to issues in measurement, and finally, presents some evidence on the consequences of social capital" (¶ 1 [PDF]).
Putnam, R. (2001). Social capital: Measurement and consequences. Canadian Journal of Policy Research, 2(1), 41-51. Retrieved from https://search.oecd.org/edu/innovation-education/1825848.pdf