Gaya APA

Snedecor, G, W., Cochran, W, G. (1968). Statistical Methods Snedecor and Cochran (Sixth . Ed.). USA: The Iowa State University Press.

Gaya MLA

Snedecor, George, W.., Cochran, William, G.. "Statistical Methods Snedecor and Cochran". Sixth . Ed. USA: The Iowa State University Press, 1968. Text.