Hays, William Lee, 1926-1995
Statistics
Holt, Rinehart and Winston, 1971
 Buku Teks
Hays, William Lee, 1926-1995
Statistics
Harcourt Brace Colege, 1994
 Buku Teks SO
Hays, William Lee, 1926-1995
Statistics
Harcourt Brace Colege, 1994
 Buku Teks SO
McClave, James T.
Statistics
Prentice-Hall, 2000
 Buku Teks SO
McClave, James T.
Statistics
Dellen Publishing, 1979
 Buku Teks SO