Pristupačnost- Putnam, Robert D. (June 2007). "E Pluribus Unum: Diversity and community in the twenty-first century". Scandinavian Political Studies. 30 (2): 137–174. doi:10.1111/j.1467-9477.2007.00176.x. The 2006 Johan Skytte Prize Lecture.
- Robert D. Putnam - Wikipedia
