APA-viite (7. p.)
The Open University. (2007). Environmental control and public health: Block 3 water pollution control. The Open University.
Chicago-viite (17. p.)
The Open University. Environmental Control and Public Health: Block 3 Water Pollution Control. United Kingdom: The Open University, 2007.
MLA-viite (9. p.)
The Open University. Environmental Control and Public Health: Block 3 Water Pollution Control. The Open University, 2007.
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