APA (7th ed.) Citation

Council of Europe & Hudson, R. (1975). Threatened birds of Europe: Based on a Council of Europe report. Macmillan.

Chicago Style (17th ed.) Citation

Council of Europe and Robert Hudson. Threatened Birds of Europe: Based on a Council of Europe Report. London: Macmillan, 1975.

MLA (9th ed.) Citation

Council of Europe and Robert Hudson. Threatened Birds of Europe: Based on a Council of Europe Report. Macmillan, 1975.