Apple.com: Macintosh Processor Upgrade Card - Read Me[permanent dead link] http://searchdocs.info.apple.com/article.html?artnum=73000
Somogyi, Stephan (August 1994). "1 - How We Got Here From There". The PowerPC Macintosh Book - The Inside Story on the New RISC-Based Macintosh. Addison-Wesley. pp. 25. ISBN 0-201-62650-0. 0-201-62650-0
Moran, Tom (March 1994). "Apple Unveils First PowerPC Product". MacWorld Magazine. pp. 34–35. https://archive.org/stream/MacWorld_9403_March_1994#page/n37/mode/2up
Apple.com: Macintosh Processor Upgrade - Description[permanent dead link] http://searchdocs.info.apple.com/article.html?artnum=16722
Somogyi, Stephan (August 1994). "1 - How We Got Here From There". The PowerPC Macintosh Book - The Inside Story on the New RISC-Based Macintosh. Addison-Wesley. pp. 25. ISBN 0-201-62650-0. 0-201-62650-0
Moran, Tom (March 1994). "Apple Unveils First PowerPC Product". MacWorld Magazine. pp. 34–35. https://archive.org/stream/MacWorld_9403_March_1994#page/n37/mode/2up
Daystartechnology.com: Daystar PowerCard 601 Archived 2006-02-18 at the Wayback Machine http://daystartechnology.com/Apple_Mac_Products/Daystar_Digital_CPU_Products/Daystar_Mac_CPU_Upgrades/Mac_CPU_PowerPC_601_Upgrades/Mac_CPU_601_Upgrade_2.html
"Lowendmac.com: PowerPC Upgrades for 68040 Macs with LC PDS". Archived from the original on 2016-09-02. Retrieved 2016-09-01. http://lowendmac.com/2016/powerpc-601-cpu-upgrades-for-68040-macs-with-lc-pds/