อ้างอิง ของ พิตต์สเบิร์ก

  1. ↑ O'Brien, Jim (1980). Pittsburgh, the story of the city of champions: the '70s—a decade unmatched in the annals of sports. Wolfson Pub. Co. ISBN 978-0-916114-07-7. Unknown parameter |coauthors= ignored (|author= suggested) (help); |access-date= requires |url= (help)
  2. ↑ Scarpaci, Joseph L (2006). "Chapter 6: Pittsburgh, City of Bridges". Pittsburgh and the Appalachians: cultural and natural resources in a postindustrial age. Pittsburgh: University of Pittsburgh Press. p. 81. ISBN 978-0-8229-4282-5. สืบค้นเมื่อ 28 February 2010. Unknown parameter |coauthors= ignored (|author= suggested) (help)
  3. ↑ Rossi, Rob (14 February 2010). "Deadline-day deal? Not likely for Penguins". Pittsburgh Tribune-Review. สืบค้นเมื่อ 28 February 2010.
  4. ↑ "Historic Pittsburgh Chronology by Decade: 1717–1749". University of Pittsburgh. October 2, 2009. สืบค้นเมื่อ October 2, 2009.
  5. ↑ "U.S. Census Bureau Delivers Pennsylvania's 2010 Census Population Totals, Including First Look at Race and Hispanic Origin Data for Legislative Redistricting". สืบค้นเมื่อ 11 March 2011.
  6. ↑ Bowling, Brian (24 March 2010). "Census: More people arrive than leave for first time in almost 20 years". Pittsburgh Tribune-Review. สืบค้นเมื่อ 1 October 2010.