Further reading
- Davies R.E.G., Airlines of the United States since 1914, IRLINES OF THE UNITED STATES SINCE 1914, Smithsonian Institution Press, Washington (D.C.), 1982
- Davies R.E.G.-Quastler I.E., Commuter airlines of the United States, Smithsonian Institution Press, Washington (D.C.), 1995
References
- Quaker City Airways Airline History, retrieved 15 March 2020^
- Queen City Flying Service Airline History, retrieved 15 March 2020^
- Ramp 66 Airline History, retrieved 15 March 2020^