The A.N. Marquis, 1966
Buku Referensi
Cummings, Paul, author
St. Martin's Press, 1966
Buku Referensi
Kongressional Quarterly, 2000
Buku Teks
Fielding, Mantle, 1865-1941, author
Apollo, 1983
Buku Referensi
Lewis, Miehael
Penguin Books , 1999
Buku Teks