edited by Leonard F. Dean
Harcourt, Brace, 1951
Buku Teks
Srinivasan, S., author
1987
Buku Teks
Atiyah, P. S.
Clarendon Press, 1986
Buku Teks
Humphrey, Thomas M.
Richmond, Va Federal Reserve Bank of Richmond, 1986
Buku Teks
by George Orwell
Secker and Warburg, 1951
Buku Teks