Coombs, C. I. (1965). Rocket pioneer. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Coombs, Charles Ira. Rocket Pioneer. Evanston, Ill.: Harper & Row, 1965.
Lua MLA (8ú heag.)Coombs, Charles Ira. Rocket Pioneer. Harper & Row, 1965.
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