Tindall, William York, author
Books for Libraries Press, 1947
Buku Teks
Ree, Jonathan, author
Clarendon Press, 1984
Buku Teks
edited by Peter Childs, Mike Storry
Routledge, 1999
Buku Referensi
Ding, Yi, 1954-, author
Foreign languages Press, 2010
Buku Teks
Ward, A.C.
The English Language Book, 1928
Buku Teks