Spiegelman, Mortimer, author
Harvard University Press, 1968
Buku Teks
Pressat, Roland, author
Methuen, 1966
Buku Teks
Hollingsworth, T.H., author
Cornell University Press, 1969
Buku Teks
Sinha, V. C.
New Delhi Allied , 1984
Buku Teks
Jain, Surender Kumar, author
The Australia National University , 1982
Buku Teks