APA
United Nations Volunteers, . (1999). United Nations Volunteers annual report. Bonn: United Nations Volunteers.
Chicago
United Nations Volunteers, . 1999. United Nations Volunteers annual report. Bonn: United Nations Volunteers.
Harvard
United Nations Volunteers, . (1999). United Nations Volunteers annual report. Bonn: United Nations Volunteers.
MLA
United Nations Volunteers, . United Nations Volunteers annual report. Bonn: United Nations Volunteers. 1999.