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 Konstantin Tsiolkovsky. In Ratcliffe, S. (Ed.), Oxford Essential Quotations. : Oxford University Press. Retrieved 30 Jun. 2022, from https://www.oxfordreference.com/view/10.1093/acref/9780191843730.001.0001/q-oro-ed5-00019349.

"Konstantin Tsiolkovsky." Oxford Essential Quotations. Ed. Ratcliffe, Susan. : Oxford University Press, . Oxford Reference. Date Accessed 30 Jun. 2022 <https://www.oxfordreference.com/view/10.1093/acref/9780191843730.001.0001/q-oro-ed5-00019349>.

"Konstantin Tsiolkovsky." In Oxford Essential Quotations, edited by Ratcliffe, Susan. : Oxford University Press, https://www.oxfordreference.com/view/10.1093/acref/9780191843730.001.0001/q-oro-ed5-00019349.