Chivian, E. (1993). Critical condition: Human health and the environment. MIT.
Chicago-viite (17. p.)Chivian, Eric. Critical Condition: Human Health and the Environment. Cambridge: MIT, 1993.
MLA-viite (9. p.)Chivian, Eric. Critical Condition: Human Health and the Environment. MIT, 1993.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.