Sanders, D. B.; Scoville, N. Z.; Solomon, P. M. (1985-02-01). «Giant molecular clouds in the Galaxy. II – Characteristics of discrete features». Astrophysical Journal, Part 1289: 373–387. doi:10.1086/162897. Bibcode: 1985ApJ...289..373S.
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 Journal667 (2): 1161. doi:10.1086/520922. Bibcode: 2007ApJ...667.1161S.
Sanders, D. B.; Scoville, N. Z.; Solomon, P. M. (1985-02-01). «Giant molecular clouds in the Galaxy. II – Characteristics of discrete features». Astrophysical Journal, Part 1289: 373–387. doi:10.1086/162897. Bibcode: 1985ApJ...289..373S.
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 Journal667 (2): 1161. doi:10.1086/520922. Bibcode: 2007ApJ...667.1161S.