參考資料
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- ^ 5.0 5.1 R. M. Gonzalez Delgado, E. Perez, C. Tadhunter J. M. Vilchez, J. M. Rodriguez-Espinosa. H II Region Population in a Sample of Nearby Galaxies with Nuclear Activity. I. Data and General Results. Astrophysical Journal Supplement. 2000, 108: 155 [2009-04-08]. doi:10.1086/312951. (原始內容存檔於2019-09-30).