APA (7th ed.) Zitazioa

Step, E. Wayside and Woodland Trees: A pocket guide to the British sylva.

Chicago Style (17th ed.) Zitazioa

Step, Edward. Wayside and Woodland Trees: A Pocket Guide to the British Sylva.

MLA (9th ed.) Zitazioa

Step, Edward. Wayside and Woodland Trees: A Pocket Guide to the British Sylva.