User:Party Escort Bot = Beans/Mini-Wiki 1/Timeline
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References
- ↑ The Up Pioneer Press cover
- ↑ Portal 2 Collector's Edition Guide
- ↑ 3.0 3.1 3.2 Portal 2: The Official Guide
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 ApertureScience.com
- ↑ 5.0 5.1 5.2 Aperture Science: A History on Game Informer
- ↑ 6.0 6.1 6.2 6.3 6.4 Portal ARG
- ↑ Portal
- ↑ 8.0 8.1 Half-Life 2 Prima Guide
- ↑ Portal commentary
- ↑ 10.0 10.1 10.2 Game Informer, April 2010 issue Cite error: Invalid
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tag; name "GI" defined multiple times with different content - ↑ Portal 2 Demo (Part 2) - E3 2010 on IGN's YouTube channel
- ↑ Portal 2 Demo (Part 3) - E3 2010 on IGN's YouTube channel
- ↑ Half-Life, PlayStation 2 version
- ↑ Thread on the ModDB forums
- ↑ 15.0 15.1 Facts about the date issue on the Marc Laidlaw Vault on the ValveTime.net Forums
- ↑ 16.0 16.1 16.2 16.3 16.4 Half-Life: Opposing Force instruction manual
- ↑ Half-Life instruction manual
- ↑ 18.0 18.1 18.2 18.3 18.4 Half-Life: Blue Shift instruction manual
- ↑ 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
- ↑ 20.0 20.1 20.2 Half-Life: Blue Shift
- ↑ 21.0 21.1 21.2 21.3 21.4 Half-Life
- ↑ Stephen Bahl as quoted on Marc Laidlaw Vault on the ValveTime.net Forums
- ↑ 23.0 23.1 Template:IA
- ↑ "Valve Plans To Bridge Portal And Portal 2 With A Surprise, Keep Gordon Freeman Out Of It" on Kotaku.com
- ↑ "How Valve Opened Up Portal 2 on Eurogamer.net
- ↑ The Final Hours of Portal 2