APA aipamena

World Health Organization. (1981). Drinking-water and sanitation, 1981-1990: A way to health. World Health Organization.

Chicago Style aipamena

World Health Organization. Drinking-water and Sanitation, 1981-1990: A Way to Health. Geneva: World Health Organization, 1981.

MLA aipamena

World Health Organization. Drinking-water and Sanitation, 1981-1990: A Way to Health. World Health Organization, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.