World checklist of birds

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• Birds of the world: A checklist
  gan: James Clements
  Cyhoeddwyd: (1981)
• The Clements checklist of birds of the world /
  gan: Clements, James F.
  Cyhoeddwyd: (2007)
• Checklist of the birds of the world 15v /
  gan: Peters, James Lee
• Checklist of the birds of the world : a complete list of the species, with names, authorities and ar /
  gan: Gruson, Edward S.
  Cyhoeddwyd: (1976)
• Howard and moore complete checklist of the birds of the world: vol.2 passerines
  Cyhoeddwyd: (2014)