Cita APA (7th ed.)

OPEC Fund for International Development, Benamara, A., & Ifeagwu, S. (1987). OPEC aid and the challenge of development. Croom Helm.

Cita Chicago (17th ed.)

OPEC Fund for International Development, Abdelkader Benamara, i Sam Ifeagwu. OPEC Aid and the Challenge of Development. London: Croom Helm, 1987.

Cita MLA (9th ed.)

OPEC Fund for International Development, et al. OPEC Aid and the Challenge of Development. Croom Helm, 1987.