Blakemore, John Sidney, author
Cambridge Univesity Press, 1985
Buku Teks
edited by M. Balkanski
North-Holland , 1991
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