@inbook{Laumann1983,
author = {Laumann, E. and Marsden, P. and Prensky, D.},
title= {The boundary specification problem in network analysis},
year = {1983},
editor = {Burt, R.S.},
editor = {Minor, M.J.},
booktitle = {Applied Network Analysis: A Methodological Introduction},
address = {London},
publisher = {Sage Publications},
pages = {18--34},
}