|<ref name="zuckerman">[{{Cite web |url=http://www.pitzer.edu/academics/faculty/zuckerman/Ath-Chap-under-7000.pdf |title=Zuckerman, Phil. "Atheism: Contemporary Rates and Patterns", from the ''Cambridge Companion to Atheism'', edited by Michael Martin, University of Cambridge Press, 2007] |access-date=2013-02-10 |archive-date=2009-06-12 |archive-url=https://web.archive.org/web/20090612114443/http://www.pitzer.edu/academics/faculty/zuckerman/Ath-Chap-under-7000.pdf |url-status=dead }}</ref>
