APA
UNITED NATIONS P. I. (. o., UNITED NATIONS P. I. (. o., . (1968). Portfolio for peace 1961-1968. New York: United Nations.
Chicago
UNITED NATIONS PUBLIC INFORMATION (Office of-), UNITED NATIONS PUBLIC INFORMATION (Office of-), . 1968. Portfolio for peace 1961-1968. New York: United Nations.
Harvard
UNITED NATIONS P. I. (. o., UNITED NATIONS P. I. (. o., . (1968). Portfolio for peace 1961-1968. New York: United Nations.
MLA
UNITED NATIONS PUBLIC INFORMATION (Office of-), UNITED NATIONS PUBLIC INFORMATION (Office of-), . Portfolio for peace 1961-1968. New York: United Nations. 1968.
