APA (7th ed.) Zitazioa

Harrison, P. (1983). Seabirds: An identification guide. Croom Helm.

Chicago Style (17th ed.) Zitazioa

Harrison, Peter. Seabirds: An Identification Guide. Kent, England, United Kingdom: Croom Helm, 1983.

MLA (9th ed.) Zitazioa

Harrison, Peter. Seabirds: An Identification Guide. Croom Helm, 1983.