Austin, Erik W.
Columbia University Press, 1986
Buku Teks
Derbyshire, Ian
Chambers, 1990
Buku Teks
Chafe, William Henry
Oxford University Press, 1995
Buku Teks
Penniman, Howard R., author
D. Van Nostrand, 1962
Buku Teks
Kendall, Willmoore, author
Louisiana University Press, 1970
Buku Teks