Understanding Variable Stars
John R. Percy · Cambridge University Press · 2007
Wikipedia
{{cite book |last=Percy |first=John R. |title=Understanding Variable Stars |publisher=Cambridge University Press |year=2007 |isbn=9780521232531}}
John R. Percy · Cambridge University Press · 2007
{{cite book |last=Percy |first=John R. |title=Understanding Variable Stars |publisher=Cambridge University Press |year=2007 |isbn=9780521232531}}