Douglas, Dan, author
Cambridge University Press, 2000
Buku Teks
Knowles, Murray, author
Routledge, 1996
Buku Teks
Revesz, G
Longmans, 1956
Buku Teks
Cook, Guy (Guy W. D.), author
Oxford University Press, 2000
Buku Teks
Koester, Almut, author
Routledge, 2006
Buku Teks