Most Russian, Ukrainian and former Soviet launchers are integrated horizontally, including Dnepr, Proton, Rockot, Shtil' and Soyuz. The Electron launch vehicle is also integrated horizontally and European Ariane 6 also uses HIF to integrate its rocket stack.
Heavy-lifting Delta 4 rocket to take test flight, Spaceflight Now, Justin Ray, 2003-11-19. http://spaceflightnow.com/news/n0311/19delta4heavy/ ↩
Complex 37, GlobalSecurity.org, John Pike, 2005-01-06. http://www.globalsecurity.org/space/facility/ccas-lc-37.htm ↩
Clark, Stephen (2009-01-12). "New SpaceX Falcon 9 rocket tests its Cape Canaveral pad". Spaceflight Now. Tonbridge, UK. Archived from the original on 2016-03-03. Retrieved 2015-01-28. http://www.spaceflightnow.com/falcon/090112f9vertical/ ↩
Space Launch Report: SpaceX Falcon Data Sheet, Ed Kyle, 2008-12-02. https://www.webcitation.org/5ko0wXd2o?url=http://www.geocities.com/launchreport/falcon9.html ↩
Falcon 1 Users Guide (Revision 7) Archived 2012-02-22 at the Wayback Machine, SpaceX, 2008-05-15, page 35. http://www.spacex.com/Falcon1UsersGuide.pdf ↩
Launch Facility Profile: Vandenberg Air Force Base Archived 2012-05-16 at the Wayback Machine, The Aerospace Corporation, 2006-02-17. http://www.aero.org/news/newsitems/vandenberg2-17-06.html ↩
Taurus II Development News, NASASpaceFlight.com Forums, Reply #7, Antonioe, 2009-01-09. http://forum.nasaspaceflight.com/index.php?topic=15457.0 ↩
"Press Release: NASA Ushers In New Space Exploration Era At Wallops Flight Facility". NASA. Retrieved 19 April 2013. https://www.nasa.gov/home/hqnews/2011/mar/HQ_11-081_HIF_Ribbon_Cutting.html ↩
Development Status of a Medium-Class Launch Vehicle for ISS Cargo and Satellite Delivery Archived 2011-06-16 at the Wayback Machine, David Steffy, Orbital Sciences Corporation, 2008-07-15, page 9. http://www.aiaa.org/pdf/conferences/Steffy_NRO-AIAA_Conference_Paper--Steffy.pdf ↩