Nevalainen, Terttu
Edinburgh University Press, 2006
Buku Teks
Irma Taavitsainen, Paivi Pahta, editor
Cambridge University Press, 2011
Buku Teks
Plucknett, Theodore Frank Thomas
At The University Press, 1958
Buku Teks
Schwyzer, Philip
Cambridge University Press, 2009
eBooks
Hewit, Douglas
Longman , 1988
Buku Teks