Snedecor, George W.
Statistical methods
Iowa State University Press, 1989
 Buku Teks
Snedecor, George W.
Statistical methods
The Iowa State University Press, 1980
 Buku Teks
Snedecor, George W.
Statistical methods
The Iowa State University Press, 1950
 Buku Teks
Snedecor, George W.
Statistical methods
The Iowa State University Press, 1982
 Buku Teks
Wilson, Frank W., editor-in-cheif
Manufacturing planning and estimating handbook; a comprehensive work on the techniques for analyzing the methods of manufacturing a product and estimating its manufacturing cost.
McGraw-Hill, 1963
 Buku Referensi