Brown, Michael E.„What is the definition of a planet?“. California Institute of Technology, Department of Geological Sciences (2004). 19-iyul 2011-yilda asl nusxadan arxivlangan. Qaraldi: 26-yanvar 2008-yil.
Brown, Michael E.„The Eight Planets“. California Institute of Technology, Department of Geological Sciences. 19-iyul 2011-yilda asl nusxadan arxivlangan. Qaraldi: 26-yanvar 2008-yil.
Thomas, Peter C.; Binzelb, Richard P.; Gaffeyc, Michael J.; Zellnerd, Benjamin H.; Storrse, Alex D.; Wells, Eddie (1997). „Vesta: Spin Pole, Size, and Shape from HST Images“. Icarus. 128-jild, № 1. 88–94-bet. Bibcode:1997Icar..128...88T. doi:10.1006/icar.1997.5736.
Thomas, Peter C.; Binzelb, Richard P.; Gaffeyc, Michael J.; Zellnerd, Benjamin H.; Storrse, Alex D.; Wells, Eddie (1997). „Vesta: Spin Pole, Size, and Shape from HST Images“. Icarus. 128-jild, № 1. 88–94-bet. Bibcode:1997Icar..128...88T. doi:10.1006/icar.1997.5736.
Cuk, Matija; Masters, Karen„Is Pluto a planet?“. Cornell University, Astronomy Department (14-sentyabr 2007-yil). 12-oktyabr 2007-yilda asl nusxadan arxivlangan. Qaraldi: 26-yanvar 2008-yil.
Phillips, Tony; Phillips, Amelia„Much Ado about Pluto“. PlutoPetition.com (4-sentyabr 2006-yil). 25-yanvar 2008-yilda asl nusxadan arxivlangan. Qaraldi: 26-yanvar 2008-yil.
Brown, Michael E.„What is the definition of a planet?“. California Institute of Technology, Department of Geological Sciences (2004). 19-iyul 2011-yilda asl nusxadan arxivlangan. Qaraldi: 26-yanvar 2008-yil.
Brown, Michael E.„The Eight Planets“. California Institute of Technology, Department of Geological Sciences. 19-iyul 2011-yilda asl nusxadan arxivlangan. Qaraldi: 26-yanvar 2008-yil.