Roulet, Eddy
Longman, 1979
Buku Teks
Moulton, William G., author
Modern Language Association of America, 1966
Buku Teks
edited by Anna Mystkowska-Wiertelak, Miroslaw Pawlak
Springer, 2012
eBooks
Ellis, Nick C., author
Wiley, 2016
Buku Teks
edited by Valerie Kinsella
Cambridge Uniiversity Press , 1979
Buku Teks