Lowe, Vincent
Times Books International, 1986
Buku Teks
Rini Darmastuti
Gaya Media, 2007
Buku Teks
Gilang Azalia
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2008
UI - Skripsi Open
edited by Mark R. Gould
[American Management Association, ], 2009
eBooks
Beeley, P.R.
Butterworth, c1980
Buku Teks