National Institute of Public Health and Environmental Protection. (1992). The environment in Europe: A global perspective. RIVM, National Institute of Public Health and Environmental Protection.
Lua i Stíl Chicago (17ú heag.)National Institute of Public Health and Environmental Protection. The Environment in Europe: A Global Perspective. The Netherlands: RIVM, National Institute of Public Health and Environmental Protection, 1992.
Lua MLA (9ú heag.)National Institute of Public Health and Environmental Protection. The Environment in Europe: A Global Perspective. RIVM, National Institute of Public Health and Environmental Protection, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.