Snedecor, George Waddel. <br/><br/>
Statistical methods / 
by George W. Snedecor, William G. Cochran. 
 - 5th ed. 
 - Ames, Iowa :  Iowa State University Press,  1956. 
 - xiii, 534 p. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics.