Werth, Alexander
Hill and Wang, 1961
Buku Teks
Fischer, Louis, author
Princeton University Press, 1951
Buku Teks
Fischer, George, author
Harvard University Press, 1952
Buku Teks
edited by Harry Daniels
Routledge, 2005
Buku Teks
Kozulin, Alex, author
Harvester Wheatsheaf, 1990
Buku Teks