International encyclopedia of the social sciences. Volume 7, 8.

Eitemau Tebyg

• Encyclopedia of the social sciences, Vol.7-8
  gan: Seligman, Edwin R A
  Cyhoeddwyd: (1959)
• The Encyclopedia of Philosophy - Volume 8 /
  gan: Paul Edwards (ed)
• International encyclopedia of science technology, Vol.8 /
  Cyhoeddwyd: (1995)
• Encyclopedia of Language and Education Volume 8: Language Socialization
  Cyhoeddwyd: (2008)
• International encyclopedia of science technology, Vol.7 /
  Cyhoeddwyd: (1995)