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Hillier R, Edwards D, Morrissey LB (2008). "Sedimentological evidence for rooting structures in the Early Devonian Anglo–Welsh Basin (UK), with speculation on their producers". Palaeogeography, Palaeoclimatology, Palaeoecology. 270 (3–4): 366–380. Bibcode:2008PPP...270..366H. doi:10.1016/j.palaeo.2008.01.038.
Canadell J, Jackson RB, Ehleringer JB, Mooney HA, Sala OE, Schulze ED (December 1996). "Maximum rooting depth of vegetation types at the global scale". Oecologia. 108 (4): 583–595. Bibcode:1996Oecol.108..583C. doi:10.1007/BF00329030. PMID28307789.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Canadell J, Jackson RB, Ehleringer JB, Mooney HA, Sala OE, Schulze ED (December 1996). "Maximum rooting depth of vegetation types at the global scale". Oecologia. 108 (4): 583–595. Bibcode:1996Oecol.108..583C. doi:10.1007/BF00329030. PMID28307789.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
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Retallack GJ (1986). "The fossil record of soils"(PDF). Dalam Wright VP. Paleosols: their Recognition and Interpretation. Oxford: Blackwell. hlm. 1–57. Diarsipkan dari versi asli(PDF) tanggal 2017-01-07.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Russell PJ, Hertz PE, McMillan B (2013). Biology: The Dynamic Science. Cengage Learning. hlm. 750. ISBN978-1-285-41534-5. Diarsipkan dari versi asli tanggal 2018-01-21. Diakses tanggal 2017-04-24.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)