पर्मियाई कल्प (Hindi Wikipedia)

Analysis of information sources in references of the Wikipedia article "पर्मियाई कल्प" in Hindi language version.

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cambridge.org

Ogg, James G.; Ogg, Gabi; Gradstein, Felix M. (2008). The Concise Geologic Time Scale. Cambridge University Press. पृ॰ 184. आई॰ऍस॰बी॰ऍन॰ 978-0-521-89849-2. मूल से 17 जून 2018 को पुरालेखित. अभिगमन तिथि 21 जुलाई 2018.

Sahney, S.; Benton, M. J. (2008). "Recovery from the most profound mass extinction of all time Archived 2018-11-11 at the वेबैक मशीन". Proceedings of the Royal Society: Biological 275 (1636): 759–65. doi:10.1098/rspb.2007.1370. PMC 2596898. PMID 18198148.

Sahney, S.; Benton, M. J. (2008). "Recovery from the most profound mass extinction of all time Archived 2018-11-11 at the वेबैक मशीन". Proceedings of the Royal Society: Biological 275 (1636): 759–65. doi:10.1098/rspb.2007.1370. PMC 2596898. PMID 18198148.

Ogg, James G.; Ogg, Gabi; Gradstein, Felix M. (2008). The Concise Geologic Time Scale. Cambridge University Press. पृ॰ 184. आई॰ऍस॰बी॰ऍन॰ 978-0-521-89849-2. मूल से 17 जून 2018 को पुरालेखित. अभिगमन तिथि 21 जुलाई 2018.
Sahney, S.; Benton, M. J. (2008). "Recovery from the most profound mass extinction of all time Archived 2018-11-11 at the वेबैक मशीन". Proceedings of the Royal Society: Biological 275 (1636): 759–65. doi:10.1098/rspb.2007.1370. PMC 2596898. PMID 18198148.