@inbook{Wellman1988,
author = {Wellman, B.},
title= {Structural Analysis: From Method and Metaphor to Theory and Substance},
year = {1988},
editor = {Wellman, B.},
editor = {Berkowitz, S.D.},
booktitle = {Social structures : a network approach},
address = {Cambridge},
publisher = {Cambridge University Press},
pages = {19--61},
}