by World Federation of Education Associations. Conference, World Federation of Education Associations

1925

by World Federation of Education Associations. Health Section

1930

by World Federation of Education Associations. Health Section

1928

by World Zionist Organization

1923

by Institute of World Affairs

1927

by World Health Organization

2022 · World Health Organization

by World Peace Foundation

1927

by World Association for Adult Education

1919

by World Association for Adult Education

1924

by Boston World peace foundation

1927

by World Peace Foundation

1927

by World Confederation of Organizations of the Teaching Profession

1962 · Washington : World Confederation of Organizations of the Teaching Profession