出典

1. ^Garfinkel, Simson L.; Mahoney, Michael K.; Silbar, Richard R.; Mallinckrodt, A. John; McKay, Susan (1993). “NeXTSTEP Programming, Step One: Object-Oriented Applications”. Computers in Physics 7 (3): 287. doi:10.1063/1.4823176. ISSN 0894-1866. https://doi.org/10.1063/1.4823176. 
2. ^Roe, Simon D. (2001-01-25). Protein Purification Techniques. Oxford University Press. ISBN 978-0-19-963674-7. https://doi.org/10.1093/oso/9780199636747.003.0006 
3. ^Dippery, Michael (2015-06-02) (英語). Professional Swift. John Wiley & Sons. ISBN 978-1-119-01677-9. https://books.google.com.au/books?id=onyzCAAAQBAJ&lpg=PA36&ots=p2sINRbQk8&dq=Project%20Builder%20%20IDE%20NeXTSTEP&pg=PA36#v=onepage&q=Project%20Builder%20%20IDE%20NeXTSTEP&f=false 
4. ^Wentk, Richard (2011-06-01) (英語). Xcode 4. John Wiley & Sons. ISBN 978-1-118-10826-0. https://books.google.com.au/books?id=ddJxAKUlN-wC&lpg=PA5&ots=kD4uvjlfOw&dq=A%20free%20copy%20of%20Project%20Builder%20was%20bundled%20with%20every%20copy%20of%20OS%20X.&pg=PA5#v=onepage&q=A%20free%20copy%20of%20Project%20Builder%20was%20bundled%20with%20every%20copy%20of%20OS%20X.&f=false 
5. ^“OS X’s ten most innovative features” (英語). Macworld. 2021年4月4日閲覧。
6. ^OS X's ten most innovative features, By Macworld Staff, Editors, Sep 13, 2010, Macworld,...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...