DiMaria, Eugene. Propfan engine seen catalyst for change. American Metal Market. Vol. 93 (Euromoney Trading Limited). June 3, 1985: 1+. ISSN 0002-9998.
Sutcliffe, Peter L. The Boeing 7J7—The evolution of technology and design. International Pacific Air and Space Technology Conference and Exposition. SAE 1987 Transactions: Aerospace 96 (Melbourne, Australia: SAE International). November 13, 1987: 6.1757–6.1768 (September 1988). ISSN 0096-736X. JSTOR 44473078. OCLC 939484633. doi:10.4271/872405. 請檢查|publication-date=中的日期值 (幫助)
GE Canada. GE aerospace: Announcing a dramatic breakthrough in aircraft technology: The propellor.. Report on Business. The Globe and Mail (Toronto, Ontario, Canada). April 14, 1987: B3. ISSN 0319-0714 –透過ProQuest. With potential fuel savings of up to 45% over the best high bypass turbofans, and at speeds of Mach .8, the UDF will mean major cost reductions and greater profitability for the airlines. This engine can also be scaled to any thrust size, to serve a wide variety of aircraft.