Watson, C. L., Henden, A. A. e Price, A., The International Variable Star Index, in Society for Astronomical Sciences, 2006, p. 47, Bibcode:2006SASS...25...47W. Vedi on line
Watson, C. L., Henden, A. A. e Price, A., The International Variable Star Index, in Society for Astronomical Sciences, 2006, p. 47, Bibcode:2006SASS...25...47W. Vedi on line