APA

Snedecor G. W., Cochran W. G., . (1980). Statistical methods. Ames, Iowa: Iowa State University Press.

Chicago

Snedecor George W, Cochran William G, . 1980. Statistical methods. Ames, Iowa: Iowa State University Press.

Harvard

Snedecor G. W., Cochran W. G., . (1980). Statistical methods. Ames, Iowa: Iowa State University Press.

MLA

Snedecor George W, Cochran William G, . Statistical methods. Ames, Iowa: Iowa State University Press. 1980.