(EN) Chris Gebhardt, Failed Battery Charge/Discharge Unit replacement complete during historic EVA, su nasaspaceflight.com, 18 ottobre 2019. URL consultato il 14 novembre 2022.
«With our colleagues safely back inside having completed their spacewalk today, we would like to acknowledge that this is a bittersweet day for all of us on the International Space Station. [...] His 12-minute excursion outside the Voskhod 2 spacecraft more than a half century ago began a chapter in human spaceflight that brought us to the moon and which will bring the world to distant ports of exploration in the cosmos in the years ahead.»
