Rowen, Colin
MIT Press, 1996
Buku Teks
by George Orwell
Secker and Warburg, 1951
Buku Teks
edited by Roy Harvey Pearce
Prentice-Hall, 1962
Buku Teks
Macaulay, T.B. (Thomas Babington)
Aldine-House, 1951
Buku Teks
Perrow, Charles
Scott, Foresman and Compant, 1978
Buku Teks