Moore, W.G.
London : Penguin Books, 1984,
Buku Referensi
London, Oxford University Press
Buku Referensi
Hart, James D., author
Oxford University Press, 1986
Buku Referensi
Hart, James D., author
Oxford University Press, 1986
Buku Referensi
edited by M.C. Howatson and Ian Chilvers
Oxford University Press, 1993
Buku Referensi