#Quelle: Barry Wellmann, Social Networks

Published by Chris Doering,

http://books.google.de/books?hl=en&lr=&id=XIw4AAAAIAAJ&oi=fnd&pg=PR7&dq=wellman+barry&ots=Mp20HmXVNY&sig=WQp7DIccX5ec1NHlbK6HdV6Dg1s#v=onepage&q=wellman%20barry&f=false

http://psycnet.apa.org/psycinfo/1988-97324-001

http://scholar.google.com/scholar?cluster=6929993693080377339&hl=en&oi=scholarr