Pugh, Eric, author
Oryx Press, 1981
Buku Referensi
Gordon, Michael, author
Kogan Page, 1984
Buku Referensi
Gordon, Michael, author
Kogan Page, 1986
Buku Referensi
Sawoniak, Henryk, author
K.G. Saur, 1992
Buku Referensi
Gunton, Tony, author
NCC Blackwell, 1993
Buku Teks