1. Rockets: Russian rocketry before World War 2;Zak,2004
2. Anatoly Zak, “Rockets: R-16 family: Nedelin disaster”, RussianSpaceWeb.com: News and history of astronautics in the former USSR, http://www.russianspaceweb.com/r16_disaster.html
3. Dr. Joseph N. Yoon, “Nedelin Disaster”, Aerospaceweb.org, www.aerospaceweb.org/question/spacecraft/q0179.shtml; A. Efimov, “Catastrophe on launch pad 41”. J-Times.ru. j-times.ru/kosmicheskiepolety/katastrofa-na-ploshhadke-41.html; Anatoly Zak, “R-7 Ballistic-Missile”, http://www.russian-spaceweb.com/r7.html; Gruntman, Blazing the Trail
4. Dnepropetrovsk (Russian: Днепропетрóвcьк) or Dnipropetrovsk (Ukrainian: Дніпропетрóвськ) is currently Ukraine’s third largest city, with about one million inhabitants. It is located southeast of Ukraine’s capital Kiev on the Dnieper River, in the south-central part of Ukraine. Dnipropetrovsk was and is one of the key centers of Soviet space industries. In particular, it is home to Yuzhnoye and to Yuzhmash (a Russian portmanteau that stands for Southern Machines), a major space and ballistic missile design bureau and manufacturer. Because of its military industry, Dnipropetrovsk was a closed city until the 1990s; Welcome to Dnipropetrovsk, hgorod.dp.ua/eng/; Yuzhmash-About Company-History-Milestones, www.Yuzhmash.com; Gruntman, Blazing the Trail
5. A.V. Zheleznyakov, Тайны ракетных катастроф Плата за прорыв в космос, (Mysteries Of Rocket Catastrophes: The Cost of Breakthroughs in Space), 2011, Яуза, ISBN: 9785699491186, www.litres.ru/aleksandr-zheleznyakov/tayny-raketnyh-katastrof-plata-za-proryv-v-kosmos/; Boris Chertok, Rockets and People Vol. II: Creating a Rocket Industry. Ed. Assif Siddiqi, NASA History Series, www.nasa.gov/pdf/635963main_RocketsPeopleVolume2-ebook.pdf; Muriel Azriel, “The Nedelin Catastrophe”, Space Safety Magazine, 28 October 2014, http://www.spacesafetymagazine.com/space-disasters/nedelin-catastrophe/historys-launch-padfailures-nedelin-disaster-part-1; Gruntman, Blazing the Trail