Rocket Men: Vostok & Voskhod. the First Soviet Manned Spaceflights (2001)

In The Rocket Men authors Rex Hall and Dave Shayler review this Soviet demonstration of technological progress from both the developmental and operational aspects which were clouded in secrecy and in direct contrast to the high profile American programme.
As the one-man Mercury spacecraft gave way to the two-man series on the American road to the Moon with Apollo, the multi-crewed Voskhod series which followed the single-seat Vostok was expected to compete with the Gemini programme. By developing the experience and techniques required to send cosmonauts to the Moon the series was planned as a stepping stone to the Soyuz and Zond lunar programmes then under development which would race Apollo to the Moon.