Cita APA (7a ed.)

Olsen, L. (2013). Tracks and Signs of the Animals and Birds of Britain and Europe. Princeton University Press.

Cita Chicago Style (17a ed.)

Olsen, Lars-Henrik. Tracks and Signs of the Animals and Birds of Britain and Europe. Princeton: Princeton University Press, 2013.

Cita MLA (8a ed.)

Olsen, Lars-Henrik. Tracks and Signs of the Animals and Birds of Britain and Europe. Princeton University Press, 2013.