Warren, S., & Warren, K. G. (2001). Multiple sclerosis. World Health Organisation.
Chicago Style aipamenaWarren, Sharon, and Kenneth G. Warren. Multiple Sclerosis. Geneva: World Health Organisation, 2001.
MLA aipamenaWarren, Sharon, and Kenneth G. Warren. Multiple Sclerosis. World Health Organisation, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.