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Ehrlich, P. R., Dobkin, D. S., & Wheye, D. (1994). The birdwatcher's handbook: A guide to the natural history of the birds of Britain and Europa : including 516 species that regularly breed in Europe and adjacent parts of the Middle East and North Africa. Oxford University Press.

Ehrlich, Paul R., David S. Dobkin, ja Darryl Wheye. The Birdwatcher's Handbook: A Guide to the Natural History of the Birds of Britain and Europa : Including 516 Species That Regularly Breed in Europe and Adjacent Parts of the Middle East and North Africa. Oxford: Oxford University Press, 1994.

Ehrlich, Paul R., et al. The Birdwatcher's Handbook: A Guide to the Natural History of the Birds of Britain and Europa : Including 516 Species That Regularly Breed in Europe and Adjacent Parts of the Middle East and North Africa. Oxford University Press, 1994.

Ehrlich, P. R., Dobkin, D. S. & Wheye, D. 1994. The birdwatcher's handbook: A guide to the natural history of the birds of Britain and Europa : including 516 species that regularly breed in Europe and adjacent parts of the Middle East and North Africa. Oxford: Oxford University Press.