The Political Behavior Program of the Survey Research Center, Institute for Social Research, University of Michigan. NATIONAL ELECTION STUDIES, 1968: PRE-/POST-ELECTION STUDY [dataset]. Ann Arbor, MI: University of Michigan, Center for Political Studies [producer and distributor], 1999.
These materials are based on work supported by the National Science Foundation under Grant Nos. : SBR-9707741, SBR-9317631, SES-9209410, SES-9009379, SES-8808361, SES-8341310, SES-8207580, and SOC77-08885.
Any opinions, findings and conclusions or recommendations expressed in these materials are those of the author(s) and do not necessarily reflect those of the National Science Foundation.