Houghton Miffiln, 1954
Buku Teks
Sansom, George Bailey, Sir, 1883-1965, author
The Gresset Press, 1950;1950;1950
Buku Teks
Sansom, George Bailey, Sir, 1883-1965, author
The Creasst Press, 1950
Buku Teks
Johnson, Elmer D., author
The Scarecrow Press, 1970
Buku Teks
editor in chief, Mortimer J. Adler
Encyclopedia Britanica, 1990
Buku Referensi