Collins, Lawrence, author
Clarendon Press, 1994
Buku Teks
Kay, Herma Hill, author
Harcourt Brace & Company, 1990
Buku Teks
Tang, Zheng Sophia, author
Edward Elgar Pub, 2016
Buku Teks
Palsson, Lennart, 1933-, author
Sijthoff, 1974
Buku Teks
Graveson, R.H.
Sweet & Maxwell, 1974
Buku Teks