Newell, Michael W., author
American Management Association, 2005
eBooks
O`Conchuir, De asun, author
[Springer, ], 2012
eBooks
edited by Linn C. Stuckenbruck
Addison-Wesley, 1981
Buku Referensi
Kuhre, W. Lee, 1947-, author
Prentice-Hall, 1995
Buku Teks
Singh, U.K., author
New Delhi : Anmol Publications, 1998,
Buku Referensi