Norri, Alan
Weidenfeld and Nicolson, 1992
Buku Teks
Carlan, Philip E., author
Jones and Bartlett , 2011
Buku Teks
by Robert Cryer ... [and others]
Cambridge University Press, 2010
Buku Teks
by Robert Cryer ... [and others]
Cambridge University Press, 2016
Buku Teks
Germann, A.C., author
C.C. Thomas, 1971
Buku Teks