Pioneer 10 Spacecraft Sends Last Signal - The last, very week signal was in January, a subsequent attempt at contact failed. - http://www.nasa.gov/centers/ames/news/releases/2003/03_25HQ.html
Pioneer 10 Makes Contact - One of the most distant probes ever launched into space has contacted Earth to say all is well. [BBC News] - http://news.bbc.co.uk/1/hi/sci/tech/1853804.stm
NASA Contacts Pioneer 10 Spacecraft - News update on the continued signal from the extrasolar craft. - http://www.space.com/missionlaunches/missions/pioneer10_wg_010430.html
Pioneer 4 - Spacecraft and mission profile from the National Space Science Data Center. - http://nssdc.gsfc.nasa.gov/nmc/tmp/1959-013A.html
Pioneer 10 - Spacecraft and mission profile from the National Space Science Data Center. - http://nssdc.gsfc.nasa.gov/nmc/tmp/1972-012A.html
Pioneer 10 Online Data Set Selector - Calculator which can tell you the location of the Pioneer 10 spacecraft. - http://dbserv.npi.msu.su/data/pioneer10.html
Pioneer 11 - Spacecraft and mission profile from the National Space Science Data Center. - http://nssdc.gsfc.nasa.gov/nmc/tmp/1973-019A.html