The Royal Danish Ministry of Foreign Affairs,, 1957
Buku Teks
Sorensen, Bent, author
Earthscan, 2011
Buku Teks
Ministry of Foreign Affairs of the Republic of Afghanistan , 1989
Buku Teks
Gathorne-Hardy, G.M., author
Oxford University Press, 1952
Buku Teks
Australian Government Publishing Service, 1989
Buku Teks