1. Defence Standard 00-970, Design and Airworthiness Requirements for Service Aircraft, Ministry of Defence, UK (undated).
2. European Aviation Safety Agency (EASA) Regulations and Certifications (undated).
3. Federal Aviation Administration (FAA) Federal Aviation Regulations, FAR (undated).
4. International Civil Aviation Organisation (ICAO) Standards, Recommended Practices and Procedures, Safety Management Manual (SMM), DOC 9859-AN 460, 2007.
5. Joint Aviation Authorities Joint Aviation Requirements, JAR (undated).