Williams, Alexander, author
Cambridge University Press, 2015
eBooks
Valin, Robert D. van, author
Cambridge University Press, 2005
Buku Teks
Griffths, Patrick, author
Edinburgh University Press, 2006
Buku Teks
Im, Ji Ryong, author
Thamchulphansa, 2010
Buku Referensi
Cruse, Alan, author
Oxford University Press, 2013
Buku Teks