Rao, G.Venkatappa
McGraw-Hill , 1996
Buku Teks
Woods, Kenneth B.
New York: McGraw-Hill, 1960
Buku Teks
Mannnering, Fred L.
John Wiley & Sons, [date of publication not identified]
Buku Teks
Mannering, Fred L.
Wiley, 1990
Buku Teks
Japan International cooperation agency, 1977
Buku Teks