Laski, Harold J., author
George Allen and Unwin, 1952
Buku Teks
Michael Nelson, Martha Craven Nussbaum, James V. Mirollo, Mera J. Flaumenhaft
Jossey-Bass, 2000
Buku Teks
Jaffe, Rivke, author
Oxford University Press, 2016
eBooks
Mintz, Sidney Wilfred
Beacon Press, 1992.
Buku Teks
Perkins, Dexter
Harvard University Press, 1947
Buku Teks