World Book Year Book : The annual Supplement to the workld book encyclopedia.

Antzeko izenburuak

• The world book encyclopedia /
  Argitaratua: (1982)
• The World book encyclopedia.
  Argitaratua: (1976)
• Encyclopedia of physical science and technology. Year book /
  Argitaratua: (1989)
• The World Book encyclopedia of people and places.
  Argitaratua: (1998)
• Britanica book of the year
  Argitaratua: (1985)