1. Alexander Schleicher GmbH. ASW 27 /ASW 27B. Source: https://www.alexander-schleicher.de/en/flugzeuge/asw-27-asw-27-b/
2. Britannica, T. 2022. Editors of Encyclopaedia (2022, December 28). compass. Encyclopedia Britannica. https://www.britannica.com/technology/compass-navigational-instrument
3. Aircraft maintenance - new trends in general aviation;Bugaj;Promet - Traffic - Traffico,2005
4. Analysis and implementation of airworthiness directives;Bugaj,2018
5. Algorithm-driven sensing devices and connected vehicle data in smart transportation networks;Campbell;Contemporary Readings in Law and Social Justice,2021