Jahr, Ernst Hakon, author
Edinburgh University Press Ltd, 2014
eBooks
Haugen, Einar
Harvard University Press, 1966
Buku Teks
Kern, Richard, author
Cambridge University Press, 2015
eBooks
Schilling, Natalie, author
Cambridge University Press, 2013
Buku Teks
Trudgill, Peter, author
Penguin, 1995
Buku Teks