Williams, B., & Epstein, S. (1958). The rocket pioneers on the road to space. New York: Julian Messner.
Čikaški stil citiranjaWilliams, Beryl., i Samuel Epstein. The Rocket Pioneers On the Road to Space. New York: Julian Messner, 1958.
MLA način citiranjaWilliams, Beryl., i Samuel Epstein. The Rocket Pioneers On the Road to Space. New York: Julian Messner, 1958.
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