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Lua i Stíl Chicago (17ú heag.)Ogg, James G., Gabi M. Ogg, agus Felix M. Gradstein. A Concise Geologic Time Scale 2016. Amsterdam: Elsevier, 2016. https://doi.org/10.1016/C2009-0-64442-1.
Lua MLA (9ú heag.)Ogg, James G., et al. A Concise Geologic Time Scale 2016. Elsevier, 2016. https://doi.org/10.1016/C2009-0-64442-1.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.