Meridians, [196?]
Buku Teks
Wright, Andrew, 1937-, author
Cambridge University Press , 1989
Buku Teks
Carroll, Noel, author
Blackwell Publishing, 2008
Buku Teks
Hartley, John, author
Routledge, 1992
Buku Teks
Forfar, Colin, author
Helath Press, 1995
Buku Teks