Bendixen, Alfred, author
Wiley-Blackwell, 2010
Buku Teks
Ann-Marie Einhaus, editor
Cambridge University Press, 2016
Buku Teks
Reid, Ian, 1943-, author
Routledge, 1994
Buku Teks
edited by Thomas Biolsi
Blackwell Publishing, 2004
Buku Teks
Hart, James, author
Oxford University Press, 1965
Buku Referensi