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Zack, et al.

Also reccomend going back to the ur-source, Ron Breiger's 1970s' "The 
Duality of Persons and Groups." Originally in a journal; reprinted in 
Wellman & Berkowitz, _Social Structures_.

  Barry Wellman

   S.D. Clark Professor of Sociology, FRSC               NetLab Director
   Department of Sociology                  725 Spadina Avenue, Room 388
   University of Toronto   Toronto Canada M5S 2J4   twitter:barrywellman             fax:+1-416-978-3963
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