Harman, S., author
DL Publication, 1977
Buku Teks
edited by Ratna Sahai
Tata Press, [date of publication not identified]
Buku Teks
Manohar Publishers & Distributors, 2007.
Buku Teks
Mann, E.A.
Sage Publications , 1992
Buku Teks
Page, David, editor
Oxford University Press, 1982
Buku Teks