A Dictionary of philosophical quotations/

Eitemau Tebyg

• Philosophical Essays /
  gan: Ayer, A. J.
  Cyhoeddwyd: (1969)
• The concise encyclopedia of western philosophy and philosophers/
  Cyhoeddwyd: (1995)
• The Penguin dictionary of quotations/
  gan: Cohen, J.M
  Cyhoeddwyd: (1968)
• A Critical history of western philosophy/
• A Dictionary of common philosophical terms/
  gan: Pence, Gregory
  Cyhoeddwyd: (2000)