Johnson, Earl S.
Macmillan, 1956
Buku Teks
Womack, James G.
Benziger Bros, 1966
Buku Teks
The Free Press, 1972
Buku Teks
Allen, Widdowson
[publisher not identified], [date of publication not identified]
Buku Teks
Oxford University Press, 1978
Buku Teks