Encyclopedia of associations : international organizations 1991, part 1
Linda Irvin, editor
Gale Research, 1991
 Buku Referensi
Encyclopedia of associations : international organizations 1991, part 2
Gale Research, 1991
 Buku Referensi
Directories in print 1991 : supplement
Gale Research, 1991
 Buku Referensi
International encyclopedia of the social sciences : bibliographical supplement, volume 18
David L. Sills, editor
The Free Press; Coolier Macmillan Publisher, 1979
 Buku Referensi
Encyclopedia of associations : volume I, national organizations of the United States
editor, Frederick G. Ruffner, Robert C. Thomas, Ann Underwood, Harold C. Young
Gale Research, 1964
 Buku Referensi