Rose-Innes, Arthur
Dover Publications, 1959
Buku Referensi
compiled by T. Geppert
Rupert Enderle, 1951
Buku Referensi
Jones, David J.
Second Back Row Press, 1981
Buku Teks
Paxton, John
J.M. Dent & Sons, 1992
Buku Referensi
Schwartz, Robert J.
Crowell , 1955
Buku Referensi