Blackwell, Matthew <br/><br/>
How to Make Causal Inferences with Time-Series Cross-Sectional Data under Selection on Observables / 
Matthew Blackwell; Adam N. Glynn. 
 - Washington:  Cambridge University Press,  Nov 2018. 
 - 112:4; 1067-1082. 
<br/><br/><label>LC Class. No.: </label>APSR  / 112:4 2018