Hardy, Alister, author
Collins, 1959
Buku Teks
Roughley, T.C., author
Angus and Robertson, 1971
Buku Teks
Roughley, T.C., author
Angus and Robertson, 1968
Buku Teks
Pandey, A.K., author
Anmol Publications, 1992
Buku Referensi
Pandey, A.K., author
Anmol Publications, 1992
Buku Referensi