Update index.md

plans/Manhattan/New York University-Bellevue/index.md

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 The New York University–Bellevue plan was adopted in 1954, last revised in 1984, and expired in 1994. It outlines primarily residential use with a small retail section in the plan area.
 
-See [References](http://www.urbanreviewer.org/#page=references.html). 
+[NYC Housing Preservation and Development, New York University-Bellevue Third Amended Urban Renewal Area Plan, Third Minor Change (1985).](https://www.nyc.gov/assets/hpd/downloads/pdfs/services/new-york-university-bellevue-third-amended-urp-third-minor-change.pdf)