ebrary, Inc, World Health Organization, & World Plumbing Council. (2006). Health aspects of plumbing. World Health Organization ; World Plumbing Council.
Chicago-referens (17:e uppl.)ebrary, Inc, World Health Organization, och World Plumbing Council. Health Aspects of Plumbing. Geneva : [S.l.]: World Health Organization ; World Plumbing Council, 2006.
MLA-referens (9:e uppl.)ebrary, Inc, et al. Health Aspects of Plumbing. World Health Organization ; World Plumbing Council, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.