Chacko, Kollenparampil C.
Vora & Co. Publishers Private Ltd. , 1957
Buku Teks
Bauer, P.T., author
Frederick A. Praeger, 1961
Buku Teks
Dubhashi, P. R.
Sage Publications, 1986
Buku Teks
Duut, VP.
University Of Indonesia Press, 1986
Buku Teks
Gupta, Anand P., author
McGraw-Hill, 1977
Buku Teks