Omar, M. Ali, author
Addison-Wesley, 1975
Buku Teks
West, Anthony R., author
John Wiley & Sons, 2014
Buku Teks
Elliott, Roger J., author
English Language Book Society, 1978
Buku Teks
Thomason, Michael, author
Reston Publishing, 1979
Buku Referensi
Academic Press, 1984
Buku Teks