Digumarti Bhaskara Rao
Discovery , 2001
Buku Teks
Joyce, James Avery
Sijthoff and Noordhoff, 1978
Buku Teks
Digumarti Bhaskara Rao, editor
Discovery Publishing House, 2001
Buku Teks
Selby, David
Cambridge University Press, 1988
Buku Teks
Schenkman Publishing company, 1974
Buku Teks