User:Party Escort Bot = Beans/Mini-Wiki 1/Timeline

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References

  1. The Up Pioneer Press cover
  2. Portal 2 Collector's Edition Guide
  3. 3.0 3.1 3.2 Portal 2: The Official Guide
  4. 4.0 4.1 4.2 4.3 4.4 4.5 ApertureScience.com
  5. 5.0 5.1 5.2 Aperture Science: A History on Game Informer
  6. 6.0 6.1 6.2 6.3 6.4 Portal ARG
  7. Portal
  8. 8.0 8.1 Half-Life 2 Prima Guide
  9. Portal commentary
  10. 10.0 10.1 10.2 Game Informer, April 2010 issue Cite error: Invalid <ref> tag; name "GI" defined multiple times with different content Cite error: Invalid <ref> tag; name "GI" defined multiple times with different content
  11. Portal 2 Demo (Part 2) - E3 2010 on IGN's YouTube channel
  12. Portal 2 Demo (Part 3) - E3 2010 on IGN's YouTube channel
  13. Half-Life, PlayStation 2 version
  14. Thread on the ModDB forums
  15. 15.0 15.1 Facts about the date issue on the Marc Laidlaw Vault on the ValveTime.net Forums
  16. 16.0 16.1 16.2 16.3 16.4 Half-Life: Opposing Force instruction manual
  17. Half-Life instruction manual
  18. 18.0 18.1 18.2 18.3 18.4 Half-Life: Blue Shift instruction manual
  19. 19.0 19.1 19.2 19.3 19.4 19.5 19.6 19.7 19.8 19.9 Half-Life PlayStation 2 instruction manual
  20. 20.0 20.1 20.2 Half-Life: Blue Shift
  21. 21.0 21.1 21.2 21.3 21.4 Half-Life
  22. Stephen Bahl as quoted on Marc Laidlaw Vault on the ValveTime.net Forums
  23. 23.0 23.1 Template:IA
  24. "Valve Plans To Bridge Portal And Portal 2 With A Surprise, Keep Gordon Freeman Out Of It" on Kotaku.com
  25. "How Valve Opened Up Portal 2 on Eurogamer.net
  26. The Final Hours of Portal 2