H.S. Stuttman, 1989
Buku Referensi
Davies, John W, author
Prentice-Hall, 2001
Buku Teks
Morley, Arthur, author
English Language Book Society, 1962
Buku Teks
Srinivasan, N.K., author
New Delhi: Oxford and IBH, 1983
Buku Teks
Van Vlack, Lawrence H., author
Addison-Wesley, 1980
Buku Teks