Neuendorf, Klaus K. E.; Institute, American Geological (2005). Glossary of Geology (v angleščini). Springer Science & Business Media. ISBN9780922152766.
Vieira, G.T.; Ferreira, A.B. (1998). »General characteristics of the glacial geomorphology of the Serra da Estrela«(PDF). V G.T. Vieira (ur.). Glacial and Periglacial Geomorphology of the Serra da Estrela. Guidebook for the field-trip IGU Commission on Climate Change and Periglacial Environments, 26–28 August 1998. str. 37–48. Arhivirano iz prvotnega spletišča(PDF) dne 24. julija 2011. Pridobljeno 16. oktobra 2011.
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Vieira, G.T.; Ferreira, A.B. (1998). »General characteristics of the glacial geomorphology of the Serra da Estrela«(PDF). V G.T. Vieira (ur.). Glacial and Periglacial Geomorphology of the Serra da Estrela. Guidebook for the field-trip IGU Commission on Climate Change and Periglacial Environments, 26–28 August 1998. str. 37–48. Arhivirano iz prvotnega spletišča(PDF) dne 24. julija 2011. Pridobljeno 16. oktobra 2011.