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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Garfinkel, Simson; Mahoney, Michael (1993). "NeXTSTEP Programming, Step One: Object-Oriented Applications" (PDF). Computers in Physics. 7 (3): 287. Bibcode:1993ComPh...7..287G. doi:10.1063/1.4823176. <a href="http://simson.net/ref/1993/NeXTSTEP3.0.pdf" target="_blank">http://simson.net/ref/1993/NeXTSTEP3.0.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>John Siracusa (May 24, 2000). "Mac OS X DP4". Ars Technica. Retrieved 2022-01-15. <a href="https://arstechnica.com/gadgets/2000/05/mac-os-x-dp4/" target="_blank">https://arstechnica.com/gadgets/2000/05/mac-os-x-dp4/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Summermatter, Paul R. (March 25, 2001). "Getting started PB -> PBX". Cocoabuilder. Archived from the original on 2015-04-29. <a href="https://web.archive.org/web/20150429125029/http://www.cocoabuilder.com/archive/cocoa/26936-getting-started-pb-pbx.html" target="_blank">https://web.archive.org/web/20150429125029/http://www.cocoabuilder.com/archive/cocoa/26936-getting-started-pb-pbx.html</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Dippery, Michael (2 June 2015). Professional Swift. John Wiley & Sons. p. 36. ISBN 9781119016779. Xcode is based on Project Builder, an IDE you use to write programs for the NeXTSTEP operating system, the forerunner of Mac OS X <a href="9781119016779" target="_blank">9781119016779</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Wentk, Richard (June 2011). Xcode 4. John Wiley & Sons. p. 5. ISBN 9781118108260. A free copy of Project Builder was bundled with every copy of OS X <a href="9781118108260" target="_blank">9781118108260</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"OS X's ten most innovative features". Macworld. Sep 13, 2010. ...Included in the package was an IDE—Project Builder—that was a tweaked version of the IDE that came with NeXT, the OS whose acquisition laid much of the foundation for OS X. In 2003, Project Builder became the now familiar Xcode... <a href="http://www.macworld.com/article/1154045/software-utilities/osx-innovative-features.html" target="_blank">http://www.macworld.com/article/1154045/software-utilities/osx-innovative-features.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> </ol>