Maíz-Apellániz, J.; Pérez, E.; Mas-Hesse, J. M. (2004). ”NGC 604, the Scaled OB Association (SOBA) Prototype. I. Spatial Distribution of the Different Gas Phases and Attenuation by Dust”. The Astronomical Journal 128 (3): sid. 1196–1218. doi:10.1086/422925. Bibcode: 2004AJ....128.1196M.
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Barba, Rodolfo (2004). ”An in-depth analysis of a prototypical giant H II region: NGC 604”. HST Proposal ID #10419: sid. 10419. Bibcode: 2004hst..prop10419B.
Maíz-Apellániz, J.; Pérez, E.; Mas-Hesse, J. M. (2004). ”NGC 604, the Scaled OB Association (SOBA) Prototype. I. Spatial Distribution of the Different Gas Phases and Attenuation by Dust”. The Astronomical Journal 128 (3): sid. 1196–1218. doi:10.1086/422925. Bibcode: 2004AJ....128.1196M.
