Carroll, John B.
Language and thought
Prentice-Hall, 1964
 Buku Teks
Crawford, William R.
A century of Latin-American thought
Frederick A. Praeger, 1961
 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