APA (7th ed.) Citation

British Ornithologists' Union & Thomson, A. L. (1964). A new dictionary of birds. Nelson.

Chicago Style (17th ed.) Citation

British Ornithologists' Union and Arthur Landsborough Thomson. A New Dictionary of Birds. London: Nelson, 1964.

MLA (9th ed.) Citation

British Ornithologists' Union and Arthur Landsborough Thomson. A New Dictionary of Birds. Nelson, 1964.