APA (7th ed.) Citation

Parkin, D. T., & Knox, A. G. (2010). The status of birds in Britain and Ireland. Christopher Helm.

Chicago Style (17th ed.) Citation

Parkin, David T., and A. G. Knox. The Status of Birds in Britain and Ireland. London: Christopher Helm, 2010.

MLA (9th ed.) Citation

Parkin, David T., and A. G. Knox. The Status of Birds in Britain and Ireland. Christopher Helm, 2010.