APA (7th ed.) Zitazioa

North Sea Task Force. (1993). North sea quality status report 1993. Olsen and Olsen.

Chicago Style (17th ed.) Zitazioa

North Sea Task Force. North Sea Quality Status Report 1993. Fredensborg: Olsen and Olsen, 1993.

MLA (9th ed.) Zitazioa

North Sea Task Force. North Sea Quality Status Report 1993. Olsen and Olsen, 1993.