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"ZZ Ceti variables". Centre deDonnées astronomiques de Strasbourg. Association Française des Observateurs d'Etoiles Variables. คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 5 February 2007. สืบค้นเมื่อ 6 June 2007.
"ZZ Ceti variables". Centre deDonnées astronomiques de Strasbourg. Association Française des Observateurs d'Etoiles Variables. คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 5 February 2007. สืบค้นเมื่อ 6 June 2007.