edited by Gesina H.J. van der Molen, Willem Petrus Josef Pompe, J.H.W. Verzyl
Nederlandse Studentenvereniging, 1956
Buku Teks
New York : United Nations, 1968,
Buku Referensi
by United Nations
Departement of Public Information - United Nations, 1956
Buku Teks
Whittaker, David J., author
Routledge, 1997
Buku Teks
Coyle, David Cushman, 1887-1969, author
The New Americanan Library, 1962
Buku Teks