edited by Edward Whiting Fox
Oxford University Press, 1957
Buku Teks
Pounds, Norman J. G., author
Frederick A. Praeger, 1964
Buku Teks
rand McNally and Company, 2003
Buku Teks
Cribb, Robert, author
Nias Press/Det Kongelige Bibliotek, 2010
Buku Teks
London Chancellor Press 1999,
Buku Referensi