Pomorska, Krystyna, author
Mouton, 1968
Buku Teks
Salverda, Reinier, author
I.C.G. Printing, 1985
Buku Teks
Forrest-Thomson, Veronica, author
Manchester University Press, 1978
Buku Teks
Brown, Richard H., author
Cambridge University Press, 1977
Buku Teks
Leeming, Glenda, author
Macmillan, 1989
Buku Teks