Freund, John E.
Modern elementary statistics
Pearson Prentice Hall, 2007
 Buku Teks SO
Freund, John E.
Modern elementary statistics
Pearson Education, 2007
 Multimedia
Freund, John E.
Modern elementary statistics
Prentice-Hall, 1980
 Buku Teks
Freund, John E.
Modern elementary statistics
Prentice-Hall, 1984
 Buku Teks SO
Hamburg, Morris
Basic statistics : a modern approach / Morris Hamburg
Harcourt Brace Javanovich , 1974
 Buku Teks SO