Hesseline, William B.
Confederate leaders in the new south
Louisiana State university Press, 1949
 Buku Teks
Edie, Carlene J.
Politics in Africa : a new beginning?
Wadsworth/Thomson Learning, 2003
 Buku Teks
Downey, Diane
Assimilating new leaders: the key to executive retention
[American Management Association, ], 2001
 eBooks
Leaders
Leaders Magazine,
 Majalah, Jurnal, Buletin
Murdock, George Peter
Africa
McGraw-Hill, 1959
 Buku Teks