Monck, Bosworth
Phoenix House Limited, 1952
Buku Teks
Chapman, Richard A., author
Constable, 1970
Buku Teks
O`toole, Barry J., author
Routledge, 2006
Buku Teks
Stout, Hiram Miller, author
The University of North Carolina Press, 1938
Buku Teks
R. A. W. Rhodes [and others]
Open University press, 2003
Buku Teks