Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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