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. Tucson: University of Arizona Press. p. 97. arXiv:astro-ph/9902246. Bibcode:2000prpl.conf...97W。
Dame, T. M.; Ungerechts, H.; Cohen, R. S.; de Geus, E. J.; Grenier, I. A.; May, J.; Murphy, D. C.; Nyman, L.-A. et al. (1987). “A composite CO survey of the entire Milky Way”. The Astrophysical Journal322: 706. doi:10.1086/165766. ISSN0004-637X.
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. Tucson: University of Arizona Press. p. 97. arXiv:astro-ph/9902246. Bibcode:2000prpl.conf...97W。
Dame, T. M.; Ungerechts, H.; Cohen, R. S.; de Geus, E. J.; Grenier, I. A.; May, J.; Murphy, D. C.; Nyman, L.-A. et al. (1987). “A composite CO survey of the entire Milky Way”. The Astrophysical Journal322: 706. doi:10.1086/165766. ISSN0004-637X.