Japan International cooperation agency, 1977
Buku Teks
Shanani, P.B.
Khanna, 1983
Buku Teks
Rao, G. Venkatappa
McGraw-Hill , 1996
Buku Teks
Wright, Paul H.
John Wiley & Sons, 2004
Buku Teks
Oglesby, Clarkson H. (Clarkson Hill), 1908-
John Wiley & Sons, 1963
Buku Teks