Tài liệu tham khảo WikiPedia: Abulfeda (hố) http://www.britannica.com/EBchecked/topic/2079/Abu... http://www.encyclopedia.com/doc/1E1-AbualFid.html http://encyclopedia2.thefreedictionary.com/Abul+Fi... http://the-moon.wikispaces.com/Abulfeda http://the-moon.wikispaces.com/Catena+Abulfeda http://lroc.sese.asu.edu/posts/571 http://www.idref.fr/026676869 http://www.lpod.org/?m=20061105 http://www.lpod.org/?m=20061108 http://www.lpod.org/archive/LPOD-2005-04-14.htm
