APA (7th ed.) Citation

Olsen, L. Tracks and signs of the animals and birds of Britain and Europe.

Chicago Style (17th ed.) Citation

Olsen, Lars-Henrik. Tracks and Signs of the Animals and Birds of Britain and Europe.

MLA (9th ed.) Citation

Olsen, Lars-Henrik. Tracks and Signs of the Animals and Birds of Britain and Europe.

Warning: These citations may not always be 100% accurate.