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If you'd like to know more about the Salyut program or the Soyuz 11 incident in particular, I recommend "Salyut - The First Space Station: Triumph and Tragedy" by Grujica S. Ivanovich (https://www.amazon.com/Salyut-Station-Triumph-Tragedy-Springer/dp/0387735852). It is super exhaustive, at times a bit dry, but I can't imagine that there's a more thorough or authoritative source in English. It includes an interview with Alexei Leonov (who was originally planned to command the mission), who communicated with the crew in orbit and offered them advice which, if followed, may have avoided the accident.