Paxton, John, author
J.M. Dent & Sons, 1992
Buku Referensi
Blakeney, E.H., author
J.M. Dent & Sons, 1952
Buku Referensi
Arnold-Baker, C., author
J.M. Dent & Sons, 1954
Buku Teks
Schwartz, Robert J., author
Crowell , 1955
Buku Referensi
Jones, David J., author
Australia, Second Back Row Press
Buku Referensi