Joy Hakim
Freedom A History of US
Oxford University Press, 2003
Buku Teks
Bury, J.B.
A history of freedom of thought
Oxford University Press, 1913
Buku Teks SO
Piggott, Stuart
Wagon, Chariot and carriage : symbol and status in the history of transport
Thames and Hudson, 1992
Buku Teks
Ritchie, Donald A.
Heritage of freedom history of the United States
Macmillan, 1985
Buku Teks SO
Levy, Leonard W.
Freedom of speech and press in early American history
Harper, 1963
Buku Teks SO