Green, John, 1977-, author
Bloomsbury, 2013
Buku Teks
Jones, Emrys, author
Oxford University Press, 1970
Buku Teks
Tikhomirav, M.
Foreign Languages Publishing House, 1959
Buku Teks
Alexander, Christopher, author
Oxford University Press, 1977
Buku Referensi
Parfect, Michael, author
Routledge, 1997
Buku Teks