Rumki Basu
SAGE Publications, 2018
Buku Teks
Nicholson, Michael, author
Cambridge University Press, 1989
Buku Teks
Douherty, James E., author
J.B. Lippincott, 1971
Buku Teks
Chilcote, Ronald H., author
Routledge, 2000
eBooks
Tim Dunne
Oxford University Press, 2010
Buku Teks