Oxford University Press, 1983
Buku Referensi
Vollnhals, Otto, author
Elsevier, 1984
Buku Referensi
Rosenberg, Jerry M., author
John Wiley & Sons, 1987
Buku Referensi
Attwood, Gaynor, author
McGraw-Hill, 1989
Buku Referensi
Meadows, A.J., author
Kogan Page, 1982
Buku Referensi