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Чикаго-гийн эшлэл (17 дахь хэвлэлт)ebrary, Inc, Jesse Ausubel, ба Robert Herman. Cities and Their Vital Systems: Infrastructure Past, Present, and Future. Washington, D.C.: National Academy Press, 1988.
MLA -ийн эшлэл (9 дэх хэвлэлт)ebrary, Inc, et al. Cities and Their Vital Systems: Infrastructure Past, Present, and Future. National Academy Press, 1988.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.