1988

1988 IUCN red list of threatened animals

Gland, Switzerland : International Union for Conservation of Nature and Natural Resources ; Cambridge, U.K. : Available from IUCN Publications Services, 1988

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1988

Birds to watch : the ICBP world checklist of threatened birds

Collar, N. J.

Washington, D.C. : Smithsonian Institution Press ; Cambridge, England : International Council for Bird Preservation, [1988]

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1990

The Illustrated encyclopaedia of birds : the definitive guide to birds of the world

Perrins, Christopher M.

London : Headline Book Publishing, 1990

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1988

Rare birds of the world

Mountfort, Guy.

London : Collins, 1988

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1985

Threatened birds of Africa and related islands

Collar, N. J.
Third edition
Cambridge, U.K. : International Council for Bird Preservation ; Gland, Switzerland : International Union for Conservation of Nature and Natural Resources, 1985

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