Cook, Thomas D. Campbell, Donald T. <br/><br/>
Quasi - Experimentation : design and analysis issues for field settings 
Thomas D. Cook , Donald T. Campbell 
 -  Houghton Mifflin Dallas  1979  1979 
 - xii , 405 p. ; 26 cm. 
<br/><br/> Bibliography : p. 387-396  Includes index 
<br/><br/><label>ISBN: </label>0395307902 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics - Experiments<br/>Quasars--QC
<br/><br/><label>LC Class. No.: </label>QC6.4.C6 1979