Bury, J.B.
A history of freedom of thught
Oxforkd Univ.Press, 1952
Buku Teks
Joy Hakim
Freedom A History of US
Oxford University Press, 2003
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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
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Ritchie, Donald A.
Heritage of freedom history of the United States
Macmillan, 1985
Buku Teks SO