Wildi, Theodore, author
Prentice-Hall, 1997
Buku Teks
Gray, C.B., author
Longman Scientific & Technical, 1989
Buku Teks
Yamayee, Zia A., author
John Wiley & Sons, 1994
Buku Teks
Mablekos, Van E., author
Harper and Row, 1980
Buku Teks
Nasar, Syed A., author
McGraw-Hill, 1995
Buku Teks