Pastoureau, Michael
Heraldry its origins and meaning
London Thames and Hudson 1997
 Buku Teks
Sellery, G. C.
Renaissance: its nature and origins
Madison: University of Wisconsin Press, 1950
 Buku Teks
Kelly, Alfred H.
The American constitution its origins and development
W.W Norton & Company Inc., c 19
 Buku Teks
Kelly, Alfred H.
The American constitution its origins and development
W.W. Norton & Company. Inc., 1963
 Buku Teks
Kelly, Alfred H.
The American constitution its origins and development
W.W. Norton & Company, 1955
 Buku Teks