Counterfactuals and Causal Inference: Methods and Principles for Social Research (Analytical Methods for Social Research)
"This book is the first representative of a growing surge of interest among social scientists and economists to reclaim their professions from the  tyrany of regression analysis and address cause-effect relationships squarely and formally.  The book is unique in recognizing the equivalence between the counterfactual and graphical approaches to causal analysis and shows readers how to best utilize the distinct features of each. An indispensible reading for every forward-looking student of quantitative social science." -Judea Pearl  University of California, Los Angeles"...Morgan and Winship have written an important, wide-ranging, careful, and original introduction to the modern literature on causal inference in nonexperimental social research."Canadian Journal of Sociology