Cita APA (7a ed.)

Keller, V. (2020). European Breeding Bird Atlas 2: Distribution, Abundance and Change. European Bird Census Council.

Cita Chicago Style (17a ed.)

Keller, Verena. European Breeding Bird Atlas 2: Distribution, Abundance and Change. Barcelona: European Bird Census Council, 2020.

Cita MLA (9a ed.)

Keller, Verena. European Breeding Bird Atlas 2: Distribution, Abundance and Change. European Bird Census Council, 2020.