Carroll, John B.
Harvad University Press, 1953
Buku Referensi
M.A.K. Kalliday
Continuum, 2004
Buku Teks
Crystal, David, 1941-, author
Blackwell Publishers, 1998
Buku Referensi
Philipp Strazny, editor
Fitzroy Dearborn, 2005
Buku Referensi
Davies, Alan, 1931 February 17-, author
Lawrence Erlbaum, 2005
Buku Referensi