* {{en}} {{cita web|url=http://www-03.ibm.com/servers/eserver/pseries/hardware/whitepapers/power4.html|titolo=POWER4 System Microarchitecture|editore=IBM}}
* {{en}} {{citeCita journalpubblicazione|authorautore=J. M. Tendler, J. S. Dodson, J. S. Fields, Jr., H. Le, and B. Sinharoy|titletitolo=POWER4 system microarchitecture|journalrivista=IBM Journal of Research and Development|volume=46|issuenumero=1|pagespagine=5-26|doi=10.1147/rd.461.0005|url=http://www.research.ibm.com/journal/rd/461/tendler.html}}
* {{en}} {{citeCita journalpubblicazione|authorautore=J. D. Warnock, J. M. Keaty, J. Petrovick, J. G. Clabes, C. J. Kircher, B. L. Krauter, P. J. Restle, B. A. Zoric, and C. J. Anderson|yearanno=2002|titletitolo=The circuit and physical design of the POWER4 microprocessor|journalrivista=IBM Journal of Research and Development|volume=46|issuenumero=1|pagespagine=27-52|doi=10.1147/rd.461.0027|url=http://www.research.ibm.com/journal/rd/461/warnock.html}}