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Massey, P; Hunter, D. (Januar 1998). »Star Formation in R136: A Cluster of O3 Stars Revealed by Hubble Space Telescope Spectroscopy«. The Astrophysical Journal. 493 (1): 180. Bibcode:1998ApJ...493..180M. doi:10.1086/305126.
Lebouteiller, V.; Bernard-Salas, J.; Brandl, B.; Whelan, D.G.; Wu, Yanling; Charmandaris, V.; Devost, D.; Houck, J.R. (Junij 2008). »Chemical Composition and Mixing in Giant H II Regions: NGC 3603, 30 Doradus, and N66«. The Astrophysical Journal. 680 (1): 398–419. arXiv:0710.4549. Bibcode:2008ApJ...680..398L. doi:10.1086/587503.
Massey, P; Hunter, D. (Januar 1998). »Star Formation in R136: A Cluster of O3 Stars Revealed by Hubble Space Telescope Spectroscopy«. The Astrophysical Journal. 493 (1): 180. Bibcode:1998ApJ...493..180M. doi:10.1086/305126.