Hickey, Raymond, 1954-, author
Wiley Blackwell, 2014
Buku Referensi
Freeborn, Dennis, author
Macmillan, 1993
Buku Teks
Baka, Farida, author
Janus Publishing , 1988
Buku Teks
Ricky Ganang, 1951-, author
National department for culture & Arts, 2009
Buku Referensi
Wortabet, John, author
Frederick Ungar Publishing, 1954
Buku Referensi