APA-referens (7:e uppl.)
The Open University. (2007). Environmental control and public health: Block 3 water pollution control. The Open University.
Chicago-referens (17:e uppl.)
The Open University. Environmental Control and Public Health: Block 3 Water Pollution Control. United Kingdom: The Open University, 2007.
MLA-referens (9:e uppl.)
The Open University. Environmental Control and Public Health: Block 3 Water Pollution Control. The Open University, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.