APA-ийн эшлэл(7 дахь хэвлэлт)
Environmental Law Institute & ebrary, Inc. (1999). Plumbing the future: Sewage infrastructure and sustainability in western Pennsylvania. Environmental Law Institute.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Environmental Law Institute ба Inc ebrary. Plumbing the Future: Sewage Infrastructure and Sustainability in Western Pennsylvania. Washington, D.C.: Environmental Law Institute, 1999.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Environmental Law Institute ба Inc ebrary. Plumbing the Future: Sewage Infrastructure and Sustainability in Western Pennsylvania. Environmental Law Institute, 1999.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.