Wade, Mark. "R-7". Encyclopedia Astronautica. Archived from the original on 29 June 2011. Retrieved 4 July 2011.
ato.ru
Vorontsov, Dmitri; Igor Afanasyev (10 November 2009). "Angara getting ready for launch". Russia CIS Observer. 3 (26). Archived from the original on 1 January 2010. Retrieved 3 January 2010.
Vorontsov, Dmitri; Igor Afanasyev (10 November 2009). "Angara getting ready for launch". Russia CIS Observer. 3 (26). Archived from the original on 1 January 2010. Retrieved 3 January 2010.