Longman , 1995
Buku Teks
Ananiadou, Sophia, author
Springer, 2012
eBooks
Dickinson, Markus, author
Wiley-Blackwell, 2013
Buku Teks
edited by Alexander Clark, Chris Fox and Shalom Lappin
Wiley-Blackwell, 2013
Buku Teks
Luc Steels, editor
Springer-Verlag, 2012
eBooks