edited by Maitland Jones Jr., Robert A. Moss
John Wiley & Sons, 1981
Buku Teks
edited by James M. Farrar and William H. Saunders
John Wiley & Sons, 1988
Buku Teks
edited by Bryant W. Rossiter, John F. Hamilton
John Wiley & Sons, 1990
Buku Teks
Mellon, M.G.
McGraw-Hill, 1982
Buku Teks
Hall, Pauline Cook
Linguistic Society of America, 1956
Buku Referensi