Moran, Robert T., author
Gulf, 1991
Buku Teks
Marker, Jamsheed, author
London : McFarland & Company, 2003, 2003
Buku Teks
Artikel Jurnal
Leritz, Len, author
[American Management Association;, ], 1994
eBooks
Idrus Nasir Djajanidingrat
Ithaca, N.Y. : Cornell University, 1958,
Buku Teks