ofthe Royal Astronomical Society of Canada, Vol. 8, p.221-2 Images of Harper's Weekly front page story. [2011-08-08]. (原始内容存档于2010-06-05). 150-year-old
Albert; Zhao, Haibin; Miles, Richard. The 2009 Apparition of methuselah comet 107P/Wilson–Harrington: A case ofcomet rejuvenation?. Planetary and Space