Cita APA (7a ed.)

De Villiers, C. (1976). African problems and challenges. Valiant.

Cita Chicago Style (17a ed.)

De Villiers, Cas. African Problems and Challenges. Sandton, South Africa: Valiant, 1976.

Cita MLA (8a ed.)

De Villiers, Cas. African Problems and Challenges. Valiant, 1976.