Severin, Tim, author
Hutchinson, 1982
Buku Teks
Urling-Smith, F.M., author
Oxford University Press, 1948
Buku Teks
Dransfield, Michael
University of Queensland Press, 1978
Buku Teks
James, Jamie, author
Didier Millet, 2011
Buku Teks
Lewis, C. S.
Harpercollins, 1980
Buku Teks