1Mark·Granovetter:The Strength of Weak Ties,American Journal of Sociology,1973,78.
2Bian Yanjie:Bringing Strong Ties Back In:Indirect Connection,Bridges,and Job Searches in China,American Sociological Review,1997,62.
3Lin Nan:Social Resources and Instrumental Action,in Social Structure and Network Analysis,edited by Peter Marsden and Lin Nan,Beverly Hills,Sage Publications,Inc.1982.p.131-147.