Gruenstein, John M. L. "The Philadelphia Area Economy : Faster Growth in the 1980s?," in Federal Reserve Bank of Philadelphia. "September/October 1985," Business Review (Federal Reserve Bank of Philadelphia) (September/October 1985) : 13-23. https://fraser.stlouisfed.org/title/5580/item/557624/toc/523646 , accessed on May 1, 2024.