Thomas, T.A.
McGraw-Hill, 1978
Buku Teks
Schmidt, Steven
Prentice-Hall, 1983
Buku Teks
Slade, Catharine
Pageone, 2002
Buku Referensi
Quinn, Gerard, author
Studio Editions, 1990
Buku Referensi
Bland, David, author
Faber and Faber LimIted, 1969
Buku Teks