edited by Martin Bulmer
Macmillan, 1984
Buku Teks
Good, Carter V.
Appleton Century Crofts, 1954
Buku Teks
Strangleman, Tim
Routledge: Taylor & Francis Group, 2008
Buku Teks
Madan, T. N.
Sage, 2011
Buku Teks
Platt, Jennifer
Cambridge University Press , 1996
Buku Teks