Black, Henry Campbell, author
West Publishing, 1990
Buku Referensi
Black, Henry Campbell, author
West Publishing, 1985
Buku Referensi
Calderwood, James D., author
Pyramid Books, 1966
Buku Teks
Jenks, Edward
John Murray, 1933
Buku Teks
McCoubrey, Hilaire, author
Black Stone Press Limited, 1999
Buku Teks