Kozulin, Alex, author
Harvester Wheatsheaf, 1990
Buku Teks
Thompson, June M., author
Westview Press, 1990
Buku Teks
Bauer, Raymond A., author
Harvard University Press, 1952; 1959
Buku Teks
Garder, Michel
Frederick A. Praeger, 1966
Buku Teks
Rothstein, Andrew, author
Penguin Books , 1950
Buku Teks