Snedecor, G. W., & Cochran, W. G. (1967). Statistical methods (6th edition.). Iowa State University Press.
Lua i Stíl Chicago (17ú heag.)Snedecor, George Waddel, agus William Gemmell Cochran. Statistical Methods. 6th edition. Ames: Iowa State University Press, 1967.
Lua MLA (9ú heag.)Snedecor, George Waddel, agus William Gemmell Cochran. Statistical Methods. 6th edition. Iowa State University Press, 1967.
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