edited by Mason Haire
John Wiley & Sons, 1959
Buku Teks
Thompson, Victor A.
Alfred A. Knopf, 1969
Buku Teks
Hatch, Mary Jo
Oxford University Press, 1997
Buku Teks
Hatch, Mary Jo
Oxford University Press, 1997
Buku Teks
French, Wendell L.
Prentice-Hall International, 1990
Buku Teks