Cheng, Eileen K.
Continuum, 2012
Buku Teks
Earnshaw, Rae A.
Springer-Verlag, 1992
Buku Referensi
Schroeder, Larry D.
Sage Publications, 1998
Buku Teks
Morris, Stephen
Prentice-Hall, 1998
Buku Teks
O`Shea, Robert P. (Robert Paul), 1953-
Harcourt Brace Jovanovich, 1993
Buku Teks