Cita APA

Stephens, P. W., Bos, E., & Vu, M. T. (1991). Africa region population projections: 1990-91. Washington: World Bank.

Citación estilo Chicago

Stephens, Patience W., Eduard Bos, and My T. Vu. Africa Region Population Projections: 1990-91. Washington: World Bank, 1991.

Cita MLA

Stephens, Patience W., Eduard Bos, and My T. Vu. Africa Region Population Projections: 1990-91. Washington: World Bank, 1991.