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[2]Arquivado 22 de xuño de 2017 en Wayback Machine. Kimball, J. 2010. Kimball's Biology Pages. Consultado o 13 de outubro de 2010. An online open source biology text by Harvard professor, and author of a general biology text, John W. Kimball.
[2]Arquivado 22 de xuño de 2017 en Wayback Machine. Kimball, J. 2010. Kimball's Biology Pages. Consultado o 13 de outubro de 2010. An online open source biology text by Harvard professor, and author of a general biology text, John W. Kimball.