1. Johnston AC, Connor R, Stephens C, Ceruzzi P (2015) Time and navigation. Smithsonian Books, Washington D.C
2. Institutul Astronomic (2021) Anuarul Astronomic (The Astronomic Almanach). Editura Academiei Române, Bucharest, Romania
3. Marcu V (1947) Tratat de Navigație Maritimă și Aeriană (Treatise on Maritime and Air Navigation). Tipografia Revistei Aeronauticii, Bucharest, Romania
4. Aron I, Lungu R, Cismaru C (1989) Sisteme de navigație aerospațială (Aerospace Navigation Systems). Ed. Scrisul Românesc, Craiova, Romania
5. National Oceanic and Atmospheric Administration (2022) NOAA World Magnetic Model (WMM). Retrieved December 16, 2021, from NCEI National Centers for Environmental Information: https://www.ncei.noaa.gov/products/world-magnetic-model. Accessed 16 Jan 2022