1. ICAO Doc 9859 AN/474 Fourth Edition. (2018) “Safety Management Manual” (SMM): chapter 2.14.
2. ICAO Doc 9734 AN/959. (2017) “Safety Oversight Manual”.
3. IOSA Standards Manual (ISM). IATA, 2018: 1200.
4. The Method for Assessing the Level of Flight Safety in Airline with Small and Medium Operations;Jastrebinskis,2016
5. Gorbachevs, O. (2017) “Aviacijas personala svarigako profesionalo iemanu novertesana”, Promocijas darbs, RTU Izdevniecība: 67–75. (into Latvian).