1. Beutelschmidt, Thomas. 2017. Ost—West—Global: Das sozialistische Fernsehen im Kalten Krieg [East—West—Global: Socialist Television in the Cold War], Berlin: Vistas.
2. Blum, Am. 2019. When Pan Am Promised to Fly Us tot he Moon [28.02.19]. Popular Mechanics. https://www.popularmechanics.com/flight/airlines/a26557979/pan-am-moon-flights/. Accessed August 10, 2020.
3. Evans, B. 2012. “It Wasn’t a Sense of Guilt”: The Flight of Vladimir Remek [06.03.12]. AmericanSpace. For a nation that explores. https://www.americaspace.com/2012/03/06/it-wasnt-a-sense-of-guilt-the-flight-of-vladimir-remek/. Accessed: August 11, 2020.
4. Eyermann, Karl-Heinz. 1976. Sojus—Apollo 1975, Leipzig: akzent.
5. Honus, Aleš. 2011. Autor ódy na Gagarina přiznal Právu: psal jsem to dvě hodiny [The author of the Ode for Gagarin admitted [to the newspaper; S.G.] to Pravo [Right]: I wrote the song in two hours] [April 12, 2011]. Novinka.cz. https://www.novinky.cz/kultura/clanek/autor-ody-na-gagarina-priznal-pravu-psal-jsem-to-dve-hodiny-85978. Accessed: August 11, 2020.