APA (7th ed.) Citation

Campbell, B., & Tinggaard, K. A. (1974). Birds in colour. (4th revised ed.). Blandford Press.

Chicago Style (17th ed.) Citation

Campbell, Bruce, and Karl Aage Tinggaard. Birds in Colour. 4th revised ed. London: Blandford Press, 1974.

MLA (9th ed.) Citation

Campbell, Bruce, and Karl Aage Tinggaard. Birds in Colour. 4th revised ed. Blandford Press, 1974.