Gaya APA
W, S., G, C. (1980).
Statistical Methods Snedecor and Cochran (7th).
USA:
The Iowa State University Press.
Gaya MLA
W, Snedecor,George., G, Cochran,William.
"Statistical Methods Snedecor and Cochran".
7th
USA:
The Iowa State University Press,
1980.
Text.