@incollection{AnheierMertens, author = {Anheier, Helmut K. and Mertens, Sybille}, title = {International and European Perspectives on the Nonprofit Sector: Data, Theory, Statistics}, series = {The non-profit sector in a changing economy}, booktitle = {The non-profit sector in a changing economy}, publisher = {OECD}, address = {Paris}, isbn = {92-64-19953-5}, pages = {269 -- 292}, language = {en} }