United Nations. Office of Public Information. (1968). Portfolio for peace: Experts from the writings and speeches of U Thant, Secretary - General of the United Nations, on major world issues 1961 - 1968. Office of Public Information.
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations. Office of Public Information. Portfolio for Peace: Experts from the Writings and Speeches of U Thant, Secretary - General of the United Nations, on Major World Issues 1961 - 1968. United Nations, New York: Office of Public Information, 1968.
Παραπομπή σε μορφή MLA (9th εκδ.)United Nations. Office of Public Information. Portfolio for Peace: Experts from the Writings and Speeches of U Thant, Secretary - General of the United Nations, on Major World Issues 1961 - 1968. Office of Public Information, 1968.