International encyclopedia of the social sciences. Volume 11, 12.

Eitemau Tebyg

• Encyclopedia of the social sciences, Vol.11-12
  gan: Seligman, Edwin R A
  Cyhoeddwyd: (1959)
• International encyclopedia of the social sciences. Volume 13, 14.
  Cyhoeddwyd: (1968)
• International encyclopedia of the social sciences. Volume 1, 2.
  Cyhoeddwyd: (1968)
• International encyclopedia of the social sciences. Volume 3, 4.
  Cyhoeddwyd: (1968)
• International encyclopedia of the social sciences. Volume 5, 6.
  Cyhoeddwyd: (1968)