Derucher, Kenneth N.
Prentice-Hall, 1981
Buku Teks
Mamlouk, Michael S., author
Pearson Prentice Hall, 2006
Buku Teks
Krebs, Robert D., author
McGraw-Hill, 1971
Buku Teks
Heins, Conrad P.
John Wiley & Sons, 1979
Buku Teks
Macmillan Education, 1988
Buku Teks