%0 Journal Article
%T Theory and Practice of Applied Social-Research
%J Evaluation quarterly
%D 1978
%A Wright, SR
%A Wright, James D.
%A Rossi, Peter H.
%V 2
%N 2
%P 171-191
%X <p>[Abstract unavailable]</p>
%G 
%I SAGE Publishing
%@ 0145-4692
%U http://dx.doi.org/