Boeing 720: Perbedaan antara revisi

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* Francillon, René. ''Boeing 707: Pioneer Jetliner''. Shrewsbury, Shropshire, UK: Motor Books International, 1999. ISBN 0-7603-0675-3
* {{cite book |last= Pither|first= Tony |title= The Boeing 707 720 and C-135|year= 1998 |publisher= [[Air-Britain|Air-Britain (Historians) Ltd]]|location=England |isbn=0-85130-236-X}}
* {{cite book |last= Proctor |first= Jon |title= Boeing 720 |year= 2001 |publisher= World Transport Press |location= Miami, FL |isbn= 1-892437-03-1 }}
* {{cite book |last= Proctor |first= Jon |coauthors= Mike Machat and Craig Kodera |title= From Props to Jets: Commercial Aviation's Transition to the Jet Age 1952–1962 |year= 2010 |publisher= Specialty Press |location= North Branch, MN |isbn= 978-1-58007-146-8 }}
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;707 sources (please move above when using specific cites for 720 info)