Das, P. K.
A.A. Balkema, 1984
Buku Referensi
Briggs, Leslie J.
Englewood Cliffs , 1981
Buku Teks
Yeaple, Franklin D.
Marcel Dekker, Inc., 1990
Buku Referensi
Swanson, Stephen R.
Prentice-Hall, 1997
Buku Teks
Walsh, Ronald A.
McGraw-Hill, 1995
Buku Referensi