Lepre، C. J.؛ Kent، D. V. (2010). "New magnetostratigraphy for the Olduvai Subchron in the Koobi Fora Formation, northwest Kenya, with implications for early Homo". Earth and Planetary Science Letters. ج. 290 ع. 3–4: 362. Bibcode:2010E&PSL.290..362L. DOI:10.1016/j.epsl.2009.12.032.
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Lepre، C. J.؛ Kent، D. V. (2010). "New magnetostratigraphy for the Olduvai Subchron in the Koobi Fora Formation, northwest Kenya, with implications for early Homo". Earth and Planetary Science Letters. ج. 290 ع. 3–4: 362. Bibcode:2010E&PSL.290..362L. DOI:10.1016/j.epsl.2009.12.032.
