UNIC, [date of publication not identified]
Buku Teks
United Nations
Kantor Penerangan PBB, [date of publication not identified]
Buku Teks
Kantor Penerangan Perserikatan Bangsa-Bangsa
Kantor Penerangan Perserikatan Bangsa-bangsa, 1993
Buku Teks
Hutauruk, M.
Erlangga, 1983
Buku Teks
Koers, Albert W.
Gadjah Mada University Press, 1991
Buku Referensi