1973 in spaceflight (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "1973 in spaceflight" in English language version.

refsWebsite

Global rank English rank

75^th place

83^rd place

1^st place

4,664^th place

3,842^nd place

2,056^th place

1,541^st place

astronautix.com

Belew, Leland F. (1977). "Skylab, Our First Space Station" (PDF). NASA. p. 61. Archived (PDF) from the original on 17 March 2010. Retrieved 7 February 2009.
Ledbetter, James (1974). "Skylab Crew Systems Mission Evaluation" (PDF). NASA. pp. 301, p.338. Archived (PDF) from the original on 26 June 2008. Retrieved 11 February 2009.

Belew, Leland F. (1977). "Skylab, Our First Space Station" (PDF). NASA. p. 61. Archived (PDF) from the original on 17 March 2010. Retrieved 7 February 2009.
Ledbetter, James (1974). "Skylab Crew Systems Mission Evaluation" (PDF). NASA. pp. 301, p.338. Archived (PDF) from the original on 26 June 2008. Retrieved 11 February 2009.