Dutton, William H
Ablex Publishing Corporation, 1985
Buku Teks
Baker, Kenneth R
John Wiley & Sons, 1985
Buku Teks
Rappaz, Michel, author
Springer-Verlag, 2003
Buku Teks
Jossey-Bass, 1973
Buku Teks SO
by G.D. Eppen ... [et.al.]
Prentice Hall International, 1998
Buku Teks