Walpole, Ronald E.
Macmillan, 1972
Buku Teks SO
Walpole, Ronald E.
Prentice-Hall, 1993
Buku Teks SO
Walpole, Ronald E.
Prentice-Hall, 2002
Buku Teks SO
Ronald E. Walpole, author; Raymond H. Myers, author; Sharon L. Myers, author; Keying Ye, author
Pearson, 2016
Buku Teks SO
Wine, Lowell R.
Prentice-Hall of India, 1966
Buku Teks SO