EarthSky | What is a magnetar? [online]. earthsky.org, 2021-06-13, [cit. 2021-09-13]. Dostupné online. (po anglicky)
forbes.com
KOBERLEIN, Brian. Just How Massive Can A Neutron Star Be? [online]. Forbes, [cit. 2021-09-13]. Dostupné online. (po anglicky)
nrao.edu
Microquasars in the Milky Way [online]. www.nrao.edu, [cit. 2021-07-11]. Dostupné online.
schoolsobservatory.org
Calculating your Weight on another Planet | National Schools' Observatory [online]. www.schoolsobservatory.org, [cit. 2021-07-29]. Dostupné online. Archivované 2021-07-29 z originálu.
web.archive.org
Calculating your Weight on another Planet | National Schools' Observatory [online]. www.schoolsobservatory.org, [cit. 2021-07-29]. Dostupné online. Archivované 2021-07-29 z originálu.