Washington. World Bank. (1991). The World Bank Annual Report 1991. External Affairs.
Cita Chicago (17th ed.)Washington. World Bank. The World Bank Annual Report 1991. Washington: External Affairs, 1991.
Cita MLA (9th ed.)Washington. World Bank. The World Bank Annual Report 1991. External Affairs, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.