雙星團
（原始內容存檔于2014-12-14）. Chaple, Glenn. A double take 39 (1). Astronomy. January 2011. SEDS page on the Double Cluster AstroPhoto.net page the Double Cluster Dark Atmospheres
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找不到關於 DoubleTake 的資料
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（原始內容存檔于2014-12-14）. Chaple, Glenn. A double take 39 (1). Astronomy. January 2011. SEDS page on the Double Cluster AstroPhoto.net page the Double Cluster Dark Atmospheres
天空傳媒(股)公司版權所有