Gordon, Michael, author
Kogan Page, 1984
Buku Referensi
Gordon, Michael, author
Kogan Page, 1986
Buku Referensi
Meadows, A.J., author
Kogan Page, 1982
Buku Referensi
Pugh, Eric, author
Oryx Press, 1981
Buku Referensi
Sawoniak, Henryk, author
K.G. Saur, 1992
Buku Referensi