1. Airline operating costs and measures of productivity;Belobaba,2009
2. Combining asset management and maintenance outsourcing reduces MRO costs, increasing ROA;Bruce;Pipeline Gas J.,2004
3. Qualitative Inquiry and Research Design: Choosing Among Five Approaches;Creswell,2013
4. Czepiel, E., 2003. Practices and perspectives in outsourcing aircraft maintenance. S. Department of Transportation Federal Aviation Administration Office of Aviation Research Press, Washington.
5. Management;Daft,2010