Palmer, Alan, author
Penguin Books, 1981
Buku Referensi
Williams, E.N., author
Allen Lane, 1980
Buku Referensi
edited by Frank N. Magill
Fitzroy Dearborn, 1996
Buku Referensi
edited by Frank N. Magill
Fitzroy Dearborn, 1996
Buku Referensi
McGraw-Hill, 1995
Buku Teks