Stenlund, Soren
Routledge, 1990
Buku Teks
Goodman, Kenneth S.
Richard C. Owen Pub. , 1987
Buku Teks
Barnard, Alan, author
Cambridge University Press, 2012
Buku Teks
Siobhan Chapman
Oxford University Press, 2005
Buku Teks
Losonsky, Michael, author
Cambridge University Press, 2006
Buku Teks