'Let's go!' – FAI celebrates 60th Anniversary of Gagarin’s space flight (angle) (2021-03-22). Alirita 2022-07-18 . “Due to Gagarin not being able to land with his aircraft as usual during aeronautical feats, there were initial concerns that the FAI would not be able to recognise his achievements. However, the FAI duly amended the rules to encompass this new form of aviation and so the awards were ratified.”.
Anikeev, Alexander (29a de Aprilo 2011). Spacecraft "Soyuz-TMA21". Manned Aeronautics. Arkivita el la originalo je 2012-03-13. Alirita 1a de Majo 2011 .
Anikeev, Alexander (29a de Aprilo 2011). Spacecraft "Soyuz-TMA21". Manned Aeronautics. Arkivita el la originalo je 2012-03-13. Alirita 1a de Majo 2011 .
