chosen by MacDonald P. Jackson and Vincent O'Sullivan
Oxford University Press, 1983
Buku Teks
King, Michael
Hodder and Stoughton, 1988
Buku Teks
Thakur, Ramesh, editor
London: Westview Press, 1986,
Buku Referensi
Departement of Statistics, 1990
Buku Referensi
chosen by Walter Murdoch and Alan Mulgan
Oxford University Press, 1950
Buku Teks