ressures and Incentives for Cooperation. Washington: The Brookings Institution. pp. 115–120. ISBN 978-0815775935.↑ Rothschild, Donald (1997). Managing Ethnic Conflict in Africa: Pressures and Incentives for Cooperation. Washington: The Brookings Institution. pp. 115–120. ISBN 978-0815775935.↑ Rothschild, Donald (1997). Managing Ethnic Conflict in Africa: Pressures and Incentives for Cooperation. Washington: The Brookings Institution. pp. 115–120. ISBN 978-0815775935.↑ Domínguez, Jorge (1989). To Make a World Safe for Revolution: Cuba's Foreign Policy. Cambridge: Harvard University Press. pp. 131–133. ISBN 978-0674893252.↑ Rothschild, Donald (1997). Managing Ethnic Conflict in Africa: Pressures and Incentives for Cooperation. Washington: The Brookings Institution. pp. 115–120. ISBN 978-0815775935.↑ Weigert, Stephen (2011). Angola: A Modern Military History. Basingstoke: Palgrave-Macmillan. pp. 56–65. ISBN 978-0230117778.↑ Weigert, Stephen (2011). Angola: A Modern Military Hi