Linze Schaap
Springer-VS, 2012
eBooks
Lerner, Max
Simon and Schuster , 1962
Buku Teks
Ruth Wodak, Majid Khosravinik, Brigite Mral
Bloomsbury Publishing, 2013
Buku Teks
Farnell, John
Palgrave Macmillan, 2016
Buku Teks
Spanier, John W.
Praeger , 1967
Buku Teks