Meek, John L., author
E and FN Spon, 1991
Buku Teks
Willems, Nicholas, author
McGraw-Hill Kogakusha, 1978
Buku Teks
Balfour, James A. D.
Collins, 1986
Buku Teks
Shaeffer, R.E., author
Prentice-Hall, 1980
Buku Teks
Ghali, A., author
Chapman and Hall , 1978
Buku Teks