Burchell, S. C.
Age of progress
Time-Life International, 1967
 Buku Teks
Rogers, William D.
The twilight struggle : the Alliance for Progress and the politics of development in Latin America
Random House, 1967
 Buku Teks
Bickel, Alexander M.
The supreme court and the idea of progress
Harper Torchbooks, 1970
 Buku Teks
Bickel, Alexander M.
The Supreme Court and the idea of progress
Harper & Row, 1970
 Buku Teks
Bickel, Alexander M.
The Supreme court and the idea of progress
Harper Torchbooks, 1970
 Buku Teks