Geoffrey, Leech N., author
Longmans, 1993
Buku Teks
Mell, Donald C.
Gale Research Company, 1982
Buku Referensi
Dieterich, Thomas G.
Center for Applied Linguistics, 1979
Buku Teks
Moulton, William G., author
Modern Language Association of America, 1966
Buku Teks
Grierson, Herbert John Clifford, Sir, 1866-1960, author
Chatto and Windus, 1950
Buku Teks