Cambridge University Press, 2003
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
Macmillan, 1951
Buku Teks
Hinton, Harold C., author
Houghton Miffiln, 1966
Buku Teks
Rourke, John T., author
McGraw-Hill, 2007
Buku Teks
Gilpin, Robert, author
Cambridge University Press, 1981
Buku Teks