Kimble, George H. T.
Tropical Africa volume 2 / George H.T. Kimble
The Twentieth Century Fund, 1960
 Buku Teks SO
Farer, Tom J.
War clouds on the Horn of Africa: a crisis for detente
Carnegie Endowment for International Peace, 1976
 Buku Teks SO
Gay, Phillip T.
Modern south Africa : a volume in the comparative societies series
McGraw-Hill, 2001
 Buku Teks SO
Marcus, Edward
Investment and development possibilities in tropical Africa
Bookman Associates, 1960
 Buku Teks
Emha Ainun Nadjib, 1953-
Kerajaan Indonesia
Progress, 2006
 Buku Teks SO