Koren, Herman, author
Lewis Publishers, 1996
Buku Referensi
Greta Thornbory and Susanna Everton, editors
Routledge, 2018
Buku Teks
edited by Greta Thornbory
Wiley Blackwell, 2009
Buku Teks
Anton, Thomas J., author
McGraw-Hill, 1979
Buku Teks
CCH Australia , 2001
Buku Teks