Links

1. For General Information and Technical Background see:
Encyclopedia Astronautica
http://www.astronautix.com/index.html

Reference Manual on the Physics of Space Security
https://www.amacad.org/content/publications/publication.aspx?d=352 https://www.amacad.org/publications/Physics_of_space_security.pdf

2. National and International Space Legislation and Policy
United Nations Office for Outer Space Affairs (UNOOSA)
http://www.oosa.unvienna.org/SpaceLaw/spacelaw.htm

EurLex:The Portal to European Union Law :
http://eur-lex.europa.eu/

International Institute of Space Law (IISL): http://www.iislweb.org/

European Centre for Space Law (ECSL)
http://www.esa.int/SPECIALS/ECSL/

International and US Space Legislation: The Archimedes Institute Library
http://www.permanent.com/archimedes/, respectively:
http://www.permanent.com/archimedes/LawLibrary.html

National Aeronautics and Space Space Administration
http://history.nasa.gov/spdocs.html

Russian Federal Space Agency
http://www.en.federalspace.ru/

3. Questions of Space Security
Space Security Index
http://spacesecurityindex.org/ 

Union of Concerned Scientists (database on operational satellites in orbit around the Earth)
http://www.ucsusa.org/nuclear_weapons_and_global_security/solutions/space-weapons/ucs-satellite-database.html - .VEEO6ufcZz8

Other relevant websites with special relevance to selected issues are also quoted in the particular chapters, sections and subsections dealing with such issues in detail.