Cita APA (7a ed.)

Hume, R., Harrop, H., Swash, A., & Still, R. (2021). Europe's Birds: An Identification Guide. Princeton University Press.

Cita Chicago Style (17a ed.)

Hume, Rob, Hugh Harrop, Andy Swash, y Robert Still. Europe's Birds: An Identification Guide. Princeton, NJ: Princeton University Press, 2021.

Cita MLA (8a ed.)

Hume, Rob, et al. Europe's Birds: An Identification Guide. Princeton University Press, 2021.