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Sandstrom, Karin M.; Peek, J. E. G.; Bower, Geoffrey C.; Bolatto, Alberto D.; Plambeck, Richard L. (2007). „A Parallactic Distance of Parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations”. The Astrophysical Journal. 667 (2): 1161. Bibcode:2007ApJ...667.1161S. arXiv:0706.2361. doi:10.1086/520922.
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Khanzadyan, T.; Smith, M. D.; Gredel, R.; Stanke, T.; Davis, C. J. (februar 2002). „Active star formation in the large Bok globule CB 34”. Astronomy and Astrophysics. 383 (2): 502—518. Bibcode:2002A&A...383..502K. doi:10.1051/0004-6361:20011531.
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Williams, J. P.; Blitz, L.; McKee, C. F. (2000). „The Structure and Evolution of Molecular Clouds: from Clumps to Cores to the IMF”. Protostars and Planets IV. стр. 97. Bibcode:2000prpl.conf...97W. arXiv:astro-ph/9902246.
Sanders, D. B.; Scoville, N. Z.; Solomon, P. M. (1. 2. 1985). „Giant molecular clouds in the Galaxy. II – Characteristics of discrete features”. Astrophysical Journal, Part 1. 289: 373—387. Bibcode:1985ApJ...289..373S. doi:10.1086/162897.
Sandstrom, Karin M.; Peek, J. E. G.; Bower, Geoffrey C.; Bolatto, Alberto D.; Plambeck, Richard L. (2007). „A Parallactic Distance of Parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations”. The Astrophysical Journal. 667 (2): 1161. Bibcode:2007ApJ...667.1161S. arXiv:0706.2361. doi:10.1086/520922.
Wilking, B. A.; Gagné, M.; Allen, L. E. (2008). „Star Formation in the ρ Ophiuchi Molecular Cloud”. Ур.: Bo Reipurth. Handbook of Star Forming Regions, Volume II: The Southern Sky ASP Monograph Publications. Bibcode:2008hsf2.book..351W. arXiv:0811.0005.
Khanzadyan, T.; Smith, M. D.; Gredel, R.; Stanke, T.; Davis, C. J. (februar 2002). „Active star formation in the large Bok globule CB 34”. Astronomy and Astrophysics. 383 (2): 502—518. Bibcode:2002A&A...383..502K. doi:10.1051/0004-6361:20011531.
nasa.gov
O'Dell, C. R. „Nebula”. World Book at NASA. World Book, Inc. Архивирано из оригинала 29. 4. 2005. г. Приступљено 18. 5. 2009.
web.archive.org
O'Dell, C. R. „Nebula”. World Book at NASA. World Book, Inc. Архивирано из оригинала 29. 4. 2005. г. Приступљено 18. 5. 2009.