Cook, Mark, author
Wiley-Blackwell, 2009
Buku Teks
Gatewood, Robert D.
The Dryden Press, 1990
Buku Teks
Puji Raharjo, author
2009
UI - Tesis (Open)
Holdsworth, Roger F., author
Brithis Institute of Management, 1972
Buku Teks
Shackelford, James F., author
CRC Press, , 1995
Buku Referensi