De Villiers, C. (1976). African problems and challenges. Valiant.
Chicagoスタイル(17版)引用形式De Villiers, Cas. African Problems and Challenges. Sandton, South Africa: Valiant, 1976.
MLA(8版)引用形式De Villiers, Cas. African Problems and Challenges. Valiant, 1976.
警告: この引用は必ずしも正確ではありません.