Richards, Y. (2012). Classification and Types of Geocentric Orbits. Delhi, India : University Publication : World Technologies.
Cita Chicago (17th ed.)Richards, Yu. Classification and Types of Geocentric Orbits. Delhi, India : University Publication : World Technologies, 2012.
Cita MLA (9th ed.)Richards, Yu. Classification and Types of Geocentric Orbits. Delhi, India : University Publication : World Technologies, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.