• John Glatt (2014) "The Fillmore West - July to September, 1968" in Live at the Fillmore East and West - Getting Backstage and Personal with Rock's Greatest Legends, Lyons Press, p. 171 ISBN 978-1-4930-1672-3
  "​In late September, Janis Joplin bought an oyster-white 1965 Porsche 356C Cabriolet from a Bevery Hills dealer for $3,500 ($24,000). After the car was delivered to her san Francisco home, she had her friend Dave Richards paint it in a stunning psychedelic design, with an image of her and the members of Big Brother and the Holding Company on the left fender. / Janis and her psychedelic Porsche soon became a common sight driving through Haight-Ashbury. It became one of her most treasured possessions. "
• Jay Ramey (2015-12-11). "Janis Joplin's Porsche 356 brings $1.76 million at auction - 1964 cabrio by Reutter led a complicated life". Autoweek.
  "​The Porsche 356 cabrio is a rare commodity in its own right -- the market discovered that there is a finite supply of these machines a number of years ago when even the least-loved examples started moving out of used car territory. ... That's why the the 1964 Porche 356 C 1600 SC cabriolet once owned by the singer-songwriter just sold for $1.76 million at RM Sotheby's "Driven by Disruption" sale in New York City. ... "

Note: underlines were added by uploader to clarify discrepancies in the production year by documents.