Rosenberg, Jerry M., author
John Wiley & Sons, 1987
Buku Referensi
Elsevier Scientific Publishing, 1971
Buku Referensi
Freedman, Alan, author
Amacom, 1995
Buku Referensi
Attwood, Gaynor, author
McGraw-Hill, 1989
Buku Referensi
Meadows, A.J., author
Kogan Page, 1982
Buku Referensi